320 ON THE EXTERNAL CHARACTERS AND 



the head of the male Southport specimen is represented of half the 

 natural size*. 



As regards the visceral anatomy, it, as might have been expected, 

 conforms closely to that of Otaria jubata, with some few minor differences. 

 I did not examine the brain, which is now mounted in the College of 

 Surgeons' Museum. 



T. Z. S. 1882, The tongue is bifid at the apex. There are only three large, pitted, 

 xi. p. 229. circumvallate papillae, arranged in the usual reversed Y ; the radix linguae 

 behind these is covered with many free papillae or processes. The 

 stomach is much like that of Otaria jubata, as depicted by Murie (I. c. 

 pi. Ixxxi. fig. 65), but is less globular and more elongated. Internally the 

 mucous membrane is soft, and raised up into numerous well-defined 

 rounded rugae, which are very irregular in disposition, curving about in 

 all directions. In the pyloric part these folds quite disappear. When 

 undistended, the greatest transverse length of the stomach is 16-5 inches, 

 and its depth, opposite the pylorus, 8-75 inches. Along the greater 

 curvature it is 29 inches. The pyloric part, which is bent back towards 

 the cardiac part, is 4' 5 inches long, measured from the angle it makes 

 with the rest of the organ. At the pylorus the stomach is about 2 inches 

 across. All these dimensions, except the extreme length, are a little 

 smaller than Dr. Murie's corresponding figures (I. c. pp. 560, 561). 



The small intestine is quite without rugae of any kind, but is covered 

 with very minute villi. The large intestine has only a few slight longi- 

 tudinal rugae, but is otherwise smooth. The caecum is, as in Otaria 

 jubata, a short, simple, conical prominence, projecting backwards for | inch. 

 The length of the small intestines is 106 feet 11 inches ; of the large, 6 

 feet 7 inches. In the Otaria jubata dissected by Murie the total length 

 of the intestines was only 65 feet 2 inches. 



The great size of the vena cava and hepatic vein causes the compara- 

 tively small liver-lobes to be, as it were, developed round them. All the 

 six lobes of the typical mammalian liver can be clearly made out, they 

 being much separated from each other by the great development of all 

 the chief fissures. Thus the umbilical fissure extends for at least three 

 fourths of the depth of the liver ; and the cystic fissure is nearly as well 

 developed, almost completely dividing the right central lobe into two. 

 The lateral lobes are not united by any hepatic tissue at all to the central 

 lobes, but are simply connected to them by means of the great vessels 

 and connective tissue. The right lateral, the two parts of the right 

 central, and the left central lobe are all comparatively long and narrow, 

 the last particularly so ; the left lateral, on the other hand, is of an 

 irregularly square shape. The caudate and Spigelian lobes are small 

 compared with the others, and are very freely attached. Both are of 

 irregular shape, the caudate being somewhat forked externally ; they 



* [The Plate as here given is one-fourth of the original.] 



