Zoological Society. 367 



ATELES FRONTALIS. At. ater, maculdfrontali semilunari albd 

 Statura At. atri, F. Cuv. 



By the white patch on the forehead and the radiation of the hair 

 from the back of the neck, this monkey approaches the At. hybridus, 

 described in the * Dictionnaire Classique d'Histoire Naturelle,* by 

 M. Isidore Geoffrey Saint-Hilaire. In the latter, however, the co- 

 lours of the body are varied and generally light, the darkest tint 

 which is mentioned as occurring on the specimen described being 

 the pure brown of the head and anterior limbs. In the Society's 

 individual, on the contrary, the whole of the hairs, with the excep- 

 tion of the frontal patch, are jet black : the naked parts of the skin 

 are also black, except a flesh-coloured space on the face including 

 the eyes, nose, and lips. It has been suspected that as the lighter- 

 coloured species of Ateles advance in age they acquire the black 

 which is so generally prevalent in the group ; but this change of 

 colour yet remains to be proved. 



Some notes by Mr. Yarrell of an examination of the body of the 

 lesser American Fly ing- Squirrel, (Pteromys volucella, Cuv.,) were 

 read. The individual examined had lived in the Society's Collec- 

 tion for upwards of a year. 



The pectoral muscles, and also the muscles of all the limbs were 

 well marked and of large size ; the clavicles perfect ; and the general 

 character of the bones similar to that of the Squirrels. The heart 

 was comparatively large, and the lungs were formed of two unequally 

 sized lobes on each side, bearing evident marks of inflammation j 

 the chest was capacious, the diaphragm being situated very low 

 down, and dividing the body into two nearly equal cavities. The 

 liver was composed of six lobes, varying in size, deeply divided, 

 and placed three on each side ; the gall-bladder was small, elon- 

 gated, and collapsed. The stomach in form and position resembled 

 that of the Squirrel; it was triangular, the apex forming the 

 pyloric portion ; the breadth 1 T V and I inch in depth. The 

 length of the small intestines was 19^- inches; the ctecum 1 inch; 

 the colon and rectum 7 inches; the ccecum also resembled that of our 

 Squirrel in form, but the membrane connecting its inner surface 

 being more free, the ccecum was less curved upon itself. The kid- 

 neys measured each -^ths of an inch in length by -rVths in breadth ; 

 they were inflamed ; and both ureters were also diseased and en- 

 larged. The subject was a female, and the uterine cornua measured 

 each 1 inch in length. The whole length of the intestinal canal was 

 28 inches ; the length of the animal from the nose to the origin of 

 the tail 4> inches. 



The stomach, ccecuni, and portions of the skeleton were laid on 

 the table. Mr. Brookes remarked that the cartilage which, passing 

 from the carpus, affords support to the volitant membrane in the 

 Flying- Squirrels, is found in all the Pteromyes and Sciuropteri ; but 

 that it does not exist in Galeopithecus. 



One of the specimens of Suricate (Ryzana tetradactyla, Illig.), 

 which were exhibited to the Committee on the 25th January, having 

 died, the following notes respecting its anatomy were read by Mr. 

 Owen. 



"The 



