332 MR. W. K, FLOWER ON PITHECIA MONACHUS. [DcC. 9, 



all along the canal almost to the duodenum. There are no valvulse 

 conniventes, and nothing to distuaguish the ileum from the jejunum. 

 The length of the colon, from the ileo-csecal valve to the anus, is 22 

 inches : it is rather smaller than the caecum in calibre, rapidly dimi- 

 nishing for the first 3 inches, then acquiring a uniform diameter of 

 about "4 inch, which is somewhat increased in the descending portion 

 and rectum. The csecum is large and long, of greater calibre than 

 the colon, from which it is distinctly marked off by a constriction, 

 passing obliquely round the intestine, and slightly diminishing in 

 size as it approaches its terminal end, which is obtuse and rounded. 

 It presents a tolerably uniform curve, almost a semicircle in the same 

 plane. Its length is 4| inches ; its diameter, at 1 inch from the ileo- 

 csecal valve, 1 inch. 



The liver weighed 190 grains. Its anterior margin is deeply cleft 

 by three fissures, dividing it into four lobes. Of these, the first (from 

 the left) and the third and fourth are of about equal size. The second 

 is double the size of either of the others, and notched on its anterior 

 margin by the fissure of the round ligament, while the gall-bladder 

 lies on its under surface. The Spigelian lobe is distinct. The cystic 

 duct is "6 inch long, and joins the hepatic duct at a very acute angle. 

 The common bile-duct, rather more than an inch in length, enters the 

 posterior part of the duodenum, with the pancreatic duct, half an inch 

 from the pylorus. The spleen is simple, long and narrow, tapering 

 at the lower, more obtuse and notched at the upper end, 2| inches 

 long, and '4 inch wide at the middle. 



The suprarenal bodies are very obtuse (slightly flattened) cones, 

 their axis measuring i inch, and the longest diameter of their base 

 about the same. The weight of each is 3 grains. Their colour is dark 

 purple, deeper than that of the kidney . The base of the right is closely 

 approximated to the corresponding kidney. The left, which is more 

 rounded in form, is less closely connected. The kidneys are of the 

 same form as in the human subject. Their length is "85 inch. The 

 right is placed slightly lower than the left. The left kidney weighed 

 24 grains ; the right about a grain less. The urinary bladder, when 

 distended, is capacious, of an elongated pyriform shape, having a glo- 

 bular fundus and a cylindrical or rather fusiform neck. The uterus 

 is very small, elongated, and cylindrical, not bifid ; • 75 inch long, and 

 •2 inch in diameter. The ovaries are "3 inch long, narrow, pointed at 

 each end, and shghtly flattened, of a pale pinkish colour. 



The vertebral formula of this specimen is, cervical 7, dorsal 1 3, 

 lumbar 6, sacral 3, caudal 26. 



There is considerable variation in the number of the vertebrae in 

 the different genera of American Monkeys ; and even among species 

 of the same genus, and individuals reputed (though perhaps on in- 

 sufficient grounds) to belong to the same species, the number is not 

 constant. The specimens contained in the British Museum (Cata- 

 logue of the Bones of Mammalia, 1862) and in the Museum of the 

 Royal College of Surgeons give the following results. Those marked 

 with an asterisk belong to the last-named collection ; the numbers in 

 the others are given on the authority of the above-named Catalogue. 



