Page 142. 
308 ON THE MANATEE. 
by a transverse slice which removed about one fourth their bulk from 
their apices. The liver may also be 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 dia-. 
phragmatic 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 (Plate [12] XXIX. 
figs. 1 and 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 benatie 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 observa- 
tions 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 to the ventral inser- 
tion of the limbs there were one or two slight mamilliform thicken- 
ings of the integument, which had no deeper-seated glands apparently 
connected with them. 
The vagina is partitioned into two parts by the transverse hymen, 
in which two small apertures exist, each not more than } inch in 
diameter. The one, the common urinogenital portion, is 2} inches long, 
with the median urethral orifice just in front of the hymenal openings. 
Between it and the short prepuce-like clitoris is a blind pocket, just 
large enough to admit the ungual phalanx of the thumb. The true 
vagina is two inches in length, with slight irregular foldings ; its walls 
are dense and fibro-cartilaginous in texture, as is the well-developed 
os uteri. The uterus closely resembles that of the Dugong, its cornua 
being 54 inches long, the body being only 2} inches, Its lining mem- 
brane is longitudinally plicated. 
