ceeded to have it prepared for the British Museum, to which insti- 

 tution they subsequently presented it. 

 The dimensions are as follow : — ■ 



ft. in. 



Total length 6 3 



Height of dorsal fin 2 5 



Breadth of it at base 1 3 



Height of ventral fin 2 3 



Girth 9 



January 23, 1849. 

 William Yarrell, Esq., Vice-President, in the Chair. 



The following papers were read : — 



1. Note on the Spermatozoa of the Giraffe (Camelopardalis 

 Giraffa). By George Gulliver, F.R.S. 



In the testicle of the Giraife that died on the 14th of this month 

 in the Society's menagerie, the semen was tolerably abundant, and 

 there were plenty of spermatozoa in the vas deferens. 



The drawings now shown were made from these spermatozoa. They 

 are represented on a scale of xoVo*^ *5^ ^"^ English inch, and magnified 

 about 700 times in diameter. 



These spermatozoa resemble in shape, size and chemical characters, 

 those of many other mammals noticed in my former observations in 

 the Proceedings of the Society, July 26, 1842, page 101 ; April 11, 

 1843 ; February 24, 1-846 ; and January 22, 1847, page 105. 



The age of the Giraffe was about fifteen years. 



2. On some new or little-known species of Monkeys. 

 By John Edward Gray, Esq., F.R.S. etc. 



The older authors have described two species of White-nosed Mon- 

 keys which have been called Hocheiirs by the French. 



In the British Museum we have specimens of each of these species, 

 and also of two very distinct kinds, which appear either not to have 

 occurred to preceding authors, or to have been confounded by them 

 with the species described by Erxleben. 



Cercopithecus melanogenys. The Black-cheeked Monkey. 



(Mammalia, PI. IX. fig. 1 .) 



Dark olive, minutely yellow grisled ; face, cheek, forehead, chest 

 and hands black ; a large cordate spot on the nose and a small spot 



