18/9.] DR. G"WYN JEFFREYS ON MOLLUSCA. 553 



adult. This fact, hitherto apparently unmentioned, naturally caused 

 my 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 Mr. Salvin and Mr. 

 Itidgway, who have seen the 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 May 25th, 1850, which died (apparently of old 

 age) on March 11th, 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 Ungulata 1 , 

 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 1 1 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 bodv. 



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. On the Mollusca procured during the ' Lightning ' and 

 ' Porcupine ; Expeditions, 1868-70. (Part II. 2 ) By J. 

 Gwyn Jeffreys, LL.D., F.R.S., P.Z.S. 



[Eeceived June 5, 1879.] 

 (Plates XLV., XLVI.) 



Preliminary remarks. 

 References will be given not only to the original authority for each 

 species, but also to a figure in some recognized publication, in default 



1 Zeitsch. fur wissenschaftl. Zoologie, Leipzig, 1878, pp. 297-344 



2 For Part I. see P. Z. S. 1878, p. 393. 



