1897.] ANATOMY OP A MANATEE. 49" 



Of the alimentary viscera I have had a drawing prepared of the 

 tongue (fig. 2, p. 48), which does "not greatly differ from that of 

 the more common American species. It appears to me, however, 

 that the lai'ge patch of circmnyallate papilla (Mayer's organ) of the 

 two sides of the tongue are a little more closely ap]3roximated 

 than in M. Jatirostris. 



The stomach of Manatus inunguis shows a few minute differences 

 from that of M. latirostris. The largest compartment of the 

 stomach is much smoother inside than in either of the two -/If. lati- 

 rostris that I examined ; in the smaller spirit-preserved specimen 

 of the latter species, indeed, the wrinkling of the sides of the 

 stomach near to its orifice into compartment IV. was so 

 marked as to suggest the ruminant reticulum. The two lateral 

 diverticula of the stomach are subequal in M. latirostris, at 

 least in the larger of the two specimens that I examined and in 

 the individuals described by Murie. But in the small J/, latirostris 

 and in M. inunguis the left is considerably the larger ; moreover, 

 this diverticulum is more coiled in the larger M. latirostris than in 

 either the small specimen or in M. inunguis — a further difference 

 which may perhaps be due to age. The unpaired glandular 

 diverticulum of the cardiac stomach is relatively shorter in the 

 large M. latirostris. 



The bile-duct and the pancreatic duct open on to prominent 

 papillse whose relative positions may be a mark of specific 

 distinction. In M. latirostris they are rather further apart, and 

 the pancreatic duct is more in front of the orifice of the ductus 

 choledochus than in M. inunguis, where the latter is behind but 

 markedly below the former. 



As to the intestinal canal, the most remarkable feature is the 

 great length of the large intestine, which is not far short of the 

 small intestine ; Peyer's patches are numerous, and in the last 

 foot of the ileum I counted twelve of them varying much in shape 

 and size, but being usually elongated and running in the furrows 

 between the rugae of the gut, as indeed Dr. Murie has noted in 

 Manatus latirostris. At the actual orifice of the intestine into the 

 csecum a patch of exceptional size is found. The general shape of 

 the csecum, which is displayed in the accompanying drawing (fig. 3, 

 p. 50), is precisely like that of the other species of Manatee, and 

 I should not have had the drawing prepared were it not for a 

 peculiar fold of mesentery which it is the main purpose of that sketch 

 to illustrate. This fold, w-hich is not referred to by Dr. Murie, 

 lies on either side of the mesentery supporting the ileum and runs 

 nearly to the csecum. It does not bear a blood-vessel, and the fold 

 of either side is continuous with its fellow by a complete bridge 

 over the front side of the ileum as is indicated in the sketch. 

 Both species are precisely alike in the presence and in the relations 

 of these two mesenteries. On cutting open the caecum it seemed 

 to me that there was a recognizable difference between the two 

 species. The two orifices of the finger-like appendages of the 

 caecum were closer together in M. latirostris aud to the orifice of 



Pboo. Zooi. Soc— 1897, No. IV. 4 



