JAN 1835 One peculiar feature noticed by Prof. Hall of some of these bodies, which he referred to Oldhamia fruticosa, is that of two of the stems being twisted together like stems of a vine growing and intertwining as if for mutual strength and support. Many of these slender thread-like stems are seen to have this feature. These are long slender stipes sometimes having numerous more slender ramifications. These differ entirely from the one mentioned above under the name Callithamnopsis, and cannot well be placed under that genus. So far as seen no true bifurcations, like the terminal parts of that one, have been detected. The branches are attached to the main stipe by a clavate or bulbous base as in that one, but instead of having numerous jointed divisions are simple and hair-like in their extension. This form I shall designate only by specific name, leaving it provisionally under the name Chatomorpha, one of our living genera, and give it the specific name prima with the following diagnosis. Chatomorpha ? prima, n. sp. PLATE XI, FIGS. 9 AND 10. Slender hair-like plants with continuous stems (i. e. not articulated), having numerous more slender filiform branches of extreme tenuity but without known bifurcations or divisions; branches attached to the main stipe or stem by bulbous bases or discs, easily separated. Bifurcations of the main stem uncertain. Stems frequently intertwining. Geological Position and Locality.-On shales of the age of the Trenton group of New York at Platteville, Wisconsin, associated with the Buthograptus laxus Hall and Callithamnopsis fruticosa. A third species, evidently allied somewhat to the preceding, is noticed on three of the blocks which bear the other forms. It is quite distinct in structure as far as can be ascertained, presenting a dense tuft or feather-like form of about one and a half inches in length, and is composed of fine hair-like fibres of great tenuity which diverge from a central stem. On close examination they are seen to be in whorls about a tenth of an inch apart. If this is their true structure the nearest living genus would probably be Dasycladus or Wrangelia. For this form I would propose the generic name Chatocladus. Chatocladus, New Genus. Marine plants with jointed cylindrical stems giving off whorls of hair-like filaments at given distances. Chatocladus plumula, n. sp. PLATE XI, FIGS. 11-13. Frond probably sessile, growing in tufts of one or more plume-like stems, composed of a cylindrical axis surrounded at intervals of about a tenth of an inch, by whorls of very fine leaflets presenting a feather-like tuft of threeeighths of an inch diameter. Formation and Locality.-In chocolate-colored shales of the Trenton group at Platteville, Wisconsin, associated with Buthograptus laxus and Callithamnopsis fruticosa Hall. About fifteen years ago, in looking over some fragments of Trenton limestone from Middleville, N. Y., I noticed some specimens resembling Corallines, and so labeled them when placing them in the cabinet, where they have remained until now, awaiting an occasion for further notice. The specimens in question have all the characteristics of the true Corallines of the present seas, and so far as can be ascertained none in which they can be said to differ. Of course they only represent detached portions of the organism, but enough remains to show the prevailing features of the species. Nothing beyond detached joints of this form of marine Algæ has hitherto rewarded the search of Palæobotanists in any of the older geological formations. Detached plates or joints of analogous bodies have been known and described under the name Calotrochium from the middle Devonian of the Eifel; and in carboniferous limestones of England other but similar bodies have been found in numbers. In the Permian rocks forms pertaining to this class of plants have been described under the generic name Gyroporella, while in the Upper Lias, in the Bavarian Alps, beds of limestones are said to be largely made up of Gyroporella and Diplopora. But no definitely formed organisms of the class have been noticed in the Paleozoic rocks. And it is not until we reach the more modern formations that anything very satisfactory is known of this class of organisms in a fossil state, although it is supposed that calcareous Algae have aided very largely in the building up of the limestones of all ages. The specimens now in hand consist of branches of from half an inch in length to one and one-fourth of an inch, with a transverse diameter of nearly one-fourth of an inch. They consist of a central or longitudinal axis which is hollow and jointed, and of whorls of lateral branches or pinnules, apparently four, possibly five in number, radiating from the central axis and forming a cylindrical body in the aggregate. The pinnules of the whorls are composed of three elements each; a first joint which diverges from the central axis gives origin to two secondary joints, while each of these supports two still smaller joints or pinnulæ. For this form I propose the generic name Primicorallina, with the following diagnosis: Primicorallina, New Genus. Articulated marine plants, consisted of elongated cylindrical fronds, composed of a central longitudinal axis, which is jointed and hollow in the fossil condition, and supports whorls of jointed pinnules from each joint; pinnules decompound. Type, P. trentonensis. These remains are of course only the calcareous coating of the real plant, the vegetable portion having been lost. The joints are irregular in form but have a generally cylindrical form. Primicorallina trentonensis, n. sp. PLATE XI, FIGS. 14-17. Fronds of small size, represented by cylindrical tufts of greater or less length, and of from one-sixth to one-fourth of an inch in diameter. Axis of the frond irregularly cylindrical and jointed; the joints count about thirty to the inch and are nearly twice as long as thick. Pinnules four, or perhaps five, from each joint of the axis, composed of cylindrical, oval or clavate joints; those originating on the axis are of nearly an equal length with the axial joints, and each supports two others on the outer end of very nearly or somewhat shorter length, but of less thickness; these again support each two others which are short oval in outline and of not more than half the length of the others. Bifurcations of the pinnules diverging at an angle of about thirty to thirty-five degrees to each other. Geological Formation and Locality.-In Trenton limestone at Middleville, N. Y. DESCRIPTION OF PLATE XI. Figs. 1-3. Buthograptus laxus Hall. Page 351. Fig. 1, view of a block showing several stipes, nat. size. Fig. 2, an enlargement to show the manner of attachment of the pinnules. Fig. 3, a single pinnule enlarged. Figs. 4-8. Callithamnopsis fruticosa Hall. Page 354. Figs. 4, 5 and 6, views of three specimens showing variations of form, enlarged 3 times. Figs. 7 and 8, further enlargements of two terminal portions of a fragment. Figs. 9, 10. Chatomorpha? prima Whitf. Page 355. Fig. 9, views of two specimens each showing two stipes intertwined, one of which retains the hair-like pinnules; Figs. two diameters. Fig. 10 shows the manner in which the pinnules are attached to the stipe. Figs. 11-13. Chatocladus plumula Whitf. Page 356. Fig. 11, view of a branch, nat. size, with a second branch on a lower lamina of shale. Fig. 12 shows the arrangement of the pinnules around the stem. Fig. 13, an enlargement showing a bifurcation and an apparent constricted or jointed character. Figs. 14-17. Primicorallina trentonensis Whitf. Page 357. Fig. 14, fragment of shale with two stipes, nat. size. Fig. 15, enlargement 4 times of a specimen in limestone. Fig. 16, enlargement of the smaller stipe on specimen Fig. 14. Fig. 17, diagram showing a sectional view with the arrangement of pinnules around the main stem. Article XVII.-REMARKS ON A SECOND COLLECTION OF MAMMALS FROM NEW BRUNSWICK, AND ON By J. A. ALLEN, I. NEW BRUNSWICK MAMMALS. The Museum has recently received a second collection of mammals from Victoria County, New Brunswick, made by Mr. John Rowley, Jr., mainly during October (Sept. 27-Nov. 7), 1894. The collection numbers about 250 specimens, and contains representatives of several species worthy of note, including two additional to those obtained last year.' Besides large series of Marten (Mustela americana), Mink (Lutreola vison), and the more common smaller mammals, additional specimens were obtained of Arvicola chrotorrhinus Miller, and Evotomys fuscodorsalis Allen, and the genus Synaptomys was found for the first time in New Brunswick. The following additions and emendations to the former list of New Brunswick mammals (1. c.) are based on Mr. Rowley's second collection, here under notice. Synaptomys cooperi Baird. LEMMING MOUSE.-Two specimens, taken as follows: Female, young adult, Tobique Point, near Andover, N. B., Sept. 28, 1894. Total length, 117 mm.; tail vertebræ, 22; hind foot, 21.6. Male, young adult, Gulquac Lake, N. B., Oct. 14. Total length, 105 mm.; tail vertebræ, 21.6; hind foot, 21.6. The capture of these specimens is of special interest, since it extends the known range of the species far to the northward of 1 See 'Notes on Mammals from New Brunswick, with Description of a New Species of Evotomys. This Bulletin, VI, 1894, PP. 99-106. |