XL. Contributions to the Fauna of Ireland. By FREDERICK MCCOY, New Books:-Illustrations of Indian Ornithology, by T. C. Jerdon.- Salictum Britannicum exsiccatum. Fasc. I. and II., by the Rev. On the Metamorphoses of the Strepsiptera, by Dr. Siebold; Descrip- tion of a new species of Nymphon, by H. D. Goodsir, Esq.; De- struction of the Orange-trees in the Azores; Meteorological Obser- XLI. Description of a new genus of Calcareous Sponge. By J. S. BOWERBANK, F.R.S., L.S. &c. (With a Plate.) XLII. On the Structure of the Cocoon of a Leach. By J. S. BOWER- BANK, F.R.S., L.S. &c. (With a Plate.) . XLIV. Additions to the Fauna of Ireland, including descriptions of some apparently new species of Invertebrata. By WILLIAM THOMPSON, Pres. Nat. Hist. and Phil. Society of Belfast. (With a Plate.) XLV. On the correct Nomenclature of the Lastræa spinosa and L. multiflora of Newman. By CHARLES C. BABINGTON, M.A., F.L.S., XLVIII. Notes on the Synonymy of the Genus Apion, with Descrip- tions of Six new Species, &c. By JOHN WALTON, Esq., F.L S. XLIX. Further Notice respecting Cyanocitta superciliosa, a sup- LII. Generic Characters of Gasterochisma melampus, a Fish which inhabits Port Nicholson, New Zealand. By JOHN RICHARDSON, M.D., la côte d'Ostende, par P.-J. Van Beneden.—Mycologia Britannica, or Specimens of British Fungi, by Ph. B. Ayres, M.D....... 346-349 Abundant Occurrence of Rare Infusoria in the Scallop; Hæmatococcus sanguineus, Ag.; Observations on the Formation of Capillaries, by E. A. Platner; Reproduction of Lost Parts in the Articulata; De- scription of a new species of Solarium, by R. B. Hinds, Esq., R.N.; Meteorological Observations and Table NUMBER C. 371-376 LIII. Descriptions of some Gigantic Forms of Invertebrate Animals from the Coast of Scotland. By HARRY D. S. GOODSIR, M.W.S. (With LV. On a Monstrosity of Gentiana campestris. By G. DICKIE, M.D., Lecturer on Botany in the University and King's College of Aberdeen. 387 LVI. Notes on the Synonymy of the Genus Apion, with Descrip- tions of Six new Species, &c. By JOHN WALTON, Esq., F.L.S.......... 392 LVII. On the British Desmidieæ. By JOHN RALFS, Esq., M.R.C.S., LVIII. Note on Mr. Bowerbank's Paper on the genus Dunstervillia (Bowerbank), with Remarks on the Ischadites Königii, the Tentaculites New Books:-Contributions towards a Fauna and Flora of the County of Cork.-Musée Botanique de M. Benjamin Delessert, par A. Lasègue. Classification der Säugethiere und Vögel, von J. J. On the Development of Doris, by C. W. Peach; On the Nidi of 442-448 LXIII. Notices of various Mammalia, with Descriptions of many 449 I. On the Anatomy of Eolis, a genus of Mollusks of the order Nudibranchiata. By ALBANY HANCOCK and DENNIS EMBLETON, M.D., F.R.C.S.E., Lecturer on Anatomy and Physiology in the Newcastle-upon-Tyne School of Medicine. [With five Plates.] THE Nudibranchiate Mollusks are divided into two families, the Doride and the Tritoniada; the anatomy of the former was fully investigated by Cuvier, that of the latter, however, was only partially examined by that illustrious physiologist; and the Elidine, a very extensive division of it, were left totally unexplored, but were nevertheless considered to agree in organization with Tritonia Hombergii, the typical form of the group. Recently however the attention of zoologists has been drawn to the subject by M. Milne Edwards, who was the first to point out that the Eolidine deviate in a very striking manner from the rest of the family. He found in the genus Calliopaa a ramified digestive apparatus. This curious organ was supposed by that gentleman to perform the double function of digestion and circulation, and consequently to have analogy with the gastro-vascular system of the Meduside on the one hand, and on the other with the Nymphon, on account of the cæcal prolongations of the digestive organ that penetrate the exterior branchial papillæ. Since this discovery there has appeared in the Annales des • We use this name to designate the subfamily of which Eolis is the type. Ann. & Mag. N. Hist. Vol. xv. B Sciences Naturelles' a very elaborate article by M. A. de Quatrefages on what that gentleman considers a new generic form, to which he has given the name Eolidina paradoxum; this he states differs from the typical organization, not only in its digestive apparatus, but also in many other respects, and in some instances in the most extraordinary manner. The subject of M. de Quatrefages' memoir however does not vary in any external characters from Eolis, to some of the British species of which it is closely allied. We should therefore expect the anatomy of Eolidina paradoxum to coincide pretty accurately with that of Eolis, at least not to deviate from it to any extent in the more important organs; yet very considerable deviations. do exist, if the observations of M. de Quatrefages be correct. Several of these observations however we are disposed to question. Previously to the publication of the memoir just named, we had investigated the anatomy of Eolis in company with Mr. Joshua Alder, and although many of our results were borne out by those of the French naturalist, yet in several important particulars we found that we entirely disagreed with him. We have therefore reinvestigated the matter with much care, and particularly with reference to the points in dispute, and have been able to corroborate our original views in the most satisfactory manner. The subject is of considerable interest, as it is principally on his views of the anatomy of Eolidina and two other allied species that M. de Quatrefages has proposed his order Phlebenterata. It is therefore desirable that the anatomy and physiology of the Eolidine should be fully ascertained. With a view to this we now publish the results of our researches, hoping that they may have the effect of fixing the attention of others more able than ourselves to inquire into the matter. We would premise that, in the following paper, where no authority is given after the name of any species mentioned, it must be understood that that species has been described by Messrs. Joshua Alder and Albany Hancock. We have chiefly turned our attention to Eolis papillosa, Johnston, probably E. Cuvierii of French authors, Pl. I. fig. 1; not more on account of its general resemblance in form to Eolidina paradoxum than for the advantages presented by its great size, which has enabled us to ascertain by actual dissection almost every point of importance. Of this species we have had numerous specimens, both alive and in spirits, and in all stages of growth, from two lines to two inches in length. It is slightly depressed, tapering more abruptly than usual to a point behind; both the dorsal and oral tentacles are simple, short and conical; the branchial papillæ are slightly compressed |