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Show 1879.] DR. GWYN JEFFREYS ON MOLLUSCA. 553 adult. This fact, hitherto apparently unmentioned, naturally caused m y brother and myself some embarrassment in naming these young birds: but at last we separately came to the conclusion that they were examples of this insular species ; and our opinion has been fortified by the opinion of two such good authorities as M r . Salvin and Mr. Ridgway, who have seen tbe specimens and given their judgment independently." Prof. Garrod, F.R.S., read a paper on the brain and other parts of the Hippopotamus (Hippopotamus amphibius). The author having had the opportunity of studying the brain of the adult male Hippopotamus presented to the Society by the late Viceroy of Egypt on M a y 25th, 1850, which died (apparently of old age) on March 11 th, 1878, described it at some length, other accounts, by Gratiolet and Macalister, having been based upon the dissection of new-born individuals. Basing his description upon the nomenclature adopted by Dr. Ureng in an important recent memoir on the brain in the Ungulata1, it was shown by the author that in the comparatively simple brain of the Hippopotamus, besides the great number of bridging convolutions laid so much stress on by Gratiolet, the middle gyrus of the outer surface of the cerebral hemisphere was peculiarly broad and bent by minor folds, at the same time that the fissura lateralis was continuous with the more anteriorly situated coronal fissure. The considerable differences between the brains of Hippopotamus and Sus were pointed out, as well as the characterizing features of the former. The enormous stomach of the adult was stated to be 11 feet in length, at the same time that its position was different from that of most animals, its long axis corresponding with that of the body. The particularly simple and transversely elongated liver, with its lengthy gall-bladder, was also described in detail. This paper will be published entire in the Society's 'Transactions.' The following papers were read :- 1. O n the Mollusca procured during the 'Lightning-' and 'Porcupine'Expeditions, 1868-70. (Part II.2) By J. G W Y N J E F F R E Y S , LL.D., F.R.S., F.Z.S. [Eeceived June 5, 1879.] (Plates XLV., XLVI.) Preliminary remarks. References will be given not only to tbe original authority for each species, but also to a figure in some recognized publication, in default i Zeitsch. fur wissenschaftl. Zoologie, Leipzig, 1878, pp. 297-344, 2 For Part I. see V. Z. S. 1878, p. 393. |