Fore wings 10-veined; median vein 3-branched, a single vein representing 4 and 5. Hind wings with 7 veins; 3 and 4 furcate on a long stem; 2 before the lower angle of the cell. Tongue present. Anerastia hæmatica Zell., fig. 14 (neuration). Anerastia hæmatica Zell., Verh. Zool.-Bot. Ver. p. 555, 1872. 9. Head and thorax dull yellow, more or less stained with rosy- Fig. 14. There is no doubt on my mind, after examining Packard's type, that it is the same species previously described by Zeller. It appears that Zeller has recognized a second closely allied species from a specimen sent him by Packard, which differs from hæmatica by the thinner, longer, labial palpi, with a brown stripe from the 2d joint outwardly to the tip. The costal stripe is said to be powdered rather thickly with brown. Packard's type does not show any brown powdering, and I cannot recognize any palpal stripe. The palpi are stained with purplish. I do not think it is likely that these characters are specific. My other specimens show a variation in size and distinctness of the reddish tinge on primaries, but I cannot see either the character pointed out by Zeller or any others on which to infer two species. Of this species, Dr. Packard says in the body of his description :-"It has all the structural characters of Nephopteryx." But in his remarks upon it a little lower down he says:-"Though the antennæ are without the usual tuft of scales, and the palpi are longer than usual, I should judge that it was a Nephopteryx." It is, however, as I have above explained, abundantly distinct from Nephopteryx in structure. It is quite necessary that the structure in this group should be fully reported in describing species. I am prevented from identifying Pempelia Hammondi with certainty, because the characters of the maxillary palpi and venation are not given by Mr. Riley. In the absence of an examination of the generic characters in this group, any opinion on the validity of "modern genera" must, I think, be without value. The following is a provisional list of our species: ART. XXVIII.-PALEONTOLOGICAL PAPERS NO. 6: DESCRIPTIONS OF NEW SPECIES OF INVERTEBRATE FOSSILS FROM THE LARAMIE GROUP. BY C. A. WHITE, M. D. The fossils described in this paper were collected by the writer (unless otherwise stated in connection with the description) from the strata of the Laramie Group, during the season of 1877, in Colorado, Wyoming, and Utah. Many other associated species were also collected, but only the hitherto undescribed forms are noticed in this paper. Of the numerous invertebrate forms hitherto collected from the strata of this great group, except some insect remains (to be described by Mr. S. H. Scudder), and a few unstudied Ostracoid Crustaceans, all are molluscan. CONCHIFERA. Genus VOLSELLA Scopoli. Subgenus BRACHYDONTES Swainson. Volsella (Brachydontes) regularis (n. sp.). Shell arcuate-subovate in marginal outline; valves moderately convex; upper margin more or less strongly arched from beak to rear; thence with a continuous but stronger curve to the postero-basal margin, which is somewhat abruptly rounded to the gently concave base; front moderately narrow, slightly projecting beyond the beaks, and abruptly rounded to the base; beaks depressed, scarcely perceptible as such, and nearly but not quite terminal; hinge-margin short, nearly straight; umbonal slope somewhat prominent, but conspicuous only by increasing the apparent concavity of the basal part of the shell. Surface marked by numerous, rather coarse, radiating lines, or small costa, which increase in size toward the free margins of the shell. These costa have generally a somewhat crenulated aspect, due in part to small sinuosities in their course, and in part to being frequently crossed by lines and undulations of growth; denticles or crenulations of the short front margin distinct. Length of the type-specimen 36 millimeters; breadth at the widest part 18 millimeters; but several less perfect examples obtained at dif ferent localities indicate a much larger size, the largest of which must have had a length of 63 centimeters. Position and locality.-Laramie Group. The type-specimen is from the Valley of Crow Creek, Northern Colorado, 15 miles above the confluence of that creek with South Platte River. Other examples are from Cañon Park, Valley of Yampa River; Danforth Hills, near White River Indian agency, Colorado; and Rock Springs Station, Union Pacific Railroad, Wyoming. Volsella (Brachydontes) laticostata (sp. nov.). Shell transversely elongate, arcuate-subelliptical; upper border broadly and almost regularly arched; posterior border somewhat abruptly but continuously rounded from the upper border to the base, which latter border is gently concave along its middle portion; front abruptly rounded, beaks inconspicuous, situated near the front; hinge-line short, nearly straight, not forming an angle with the remainder of the upper border; denticles, or crenulations of the anterior border, distinct. Surface marked by the usual distinct lines of growth, and also by fine radiating costa, which are obsolete along the whole length of the median portion of the shell, and are more distinct upon and near the dorsal border than elsewhere. Length 5 centimeters; greatest width 19 millimeters. This species differs conspicuously from the preceding one, which is from the same formation, in its greater proportionate length, the straighter and less crenulate character of its coste, and their absence or obsolescence upon the median portion of the shell. Position and locality.-Laramie Group, about 400 feet from its base; Danforth Hills, near White River Indian agency, Colorado. Genus NUCULANA Link. Nuculana inclara (sp. nov.). Shell small, elongate-subovate in marginal outline, gradually narrowing behind the beaks. Beaks not prominent, situated about one-third of the full length of the shell from the front; valves only moderately convex, even in the anterior and umbonal regions, and without distinct umbonal ridges. Basal margin broadly semi-elliptical; anterior margin regularly rounded from the cardinal margin to the base; postero-basal margin sloping upward to the posterior margin, which is sharply rounded to the cardinal margin; the latter margin slightly arched, or the anterior and posterior portions of it forming a very slight angle with each other; denticles minute, numerous, 12 to 15 or more in front of the beak and a greater number behind it. The few examples discovered being only casts, the true character of the surface is not known, but it appears to have been marked with only the usual concentric lines of growth. Character of the pallial line unknown. Length 11 millimeters; height from base to beaks 5 millimeters. No |