ME. A. H. GAEEOD ON THE MANATEE. 141 



commencement of the colon are, when undisturbed, situated in the left diaphragmatic 



corner of the umbilical region of the abdomen. The following are the lengths 

 of the intestinal viscera ; — 



ft. in. 



Small intestine 31 2 



Large intestine 20 3 



*o^ 



^1 



o 



Caeca from apices to ileo-caecal valve .... 

 Each caecum externally 1|- 



The stomach was small in comparison with the size of the animal. The same may 

 be also more certainly said of the bifid heart and of the lozenge-shaped spleen. 



The liver has a very peculiar shape, resulting from the very aberrant position of the 

 lungs, which much curtail the transverse space usually occupied by that organ. Dr. 

 Murie remarks, " In situ, but still more so when removed, the entire liver has great 

 resemblance in shape to the inflated lungs of an ordinary mammal." This accurate simile 

 would be even more so if the organ were compared to the lungs of a mammal distended 

 with, say, solid jelly, and then cut down by a transverse slice which removed about 

 one fourth their bulk from their apices. The liver may be also said to form a cylinder, 

 flattened from before backwards, transversely truncated in front, and irregularly excavated 

 behind, or on its abdominal surface. The heart rests, with the intervention of a fibrous 

 expansion from the diaphragm, on the truncated anterior end of the organ, which 

 corresponds to the diaphragmatic surface as usually described. Its dorsal surface is 

 separated entirely from the spinal column by the interpolation of the lungs between 

 the two. 



The bulk of the liver is formed' by the two lateral lobes, between which, at the 

 anterior end, are wedged the central lobes, the right of which is considerably the 

 larger. The drawings (PI. XXIX. figs. 1 & 2) will explain this better than any amount 

 of description. The suspensory ligament is strong, and the umbilical notch small. The 

 right lateral fissure is not deep, and does not extend up to the truncate superior surface, 

 whilst the left lateral is considerable and does so, going quite to its vertebral border. 

 The caudate lobe is only a slight extension of hepatic tissue along the vena cava : the 

 Spigelian is elongate, conical, and directed backwards ; it is well seen in the dorsal 

 view. 



Another peculiarity is a considerable bridge of hepatic tissue, extending, on the 

 concave abdominal surface of the liver, from the vertebral portion of the right central 

 lobe to the middle of the left lateral lobe. This bridge is not quite half as broad as it 

 is long, and it is bent into a semicircle, the convexity of which is directed abdominally. 



With reference to the parts connected with generation, my observations entirely 

 agree with those of Dr. Murie so far as the mammary development is concerned. No 

 teats were to be found, nor any decided indications of their whereabouts. Just internal 



