ON ARCTOCEBUS CALABARENSIS 609 
which presented the remains of the red injection, while the others 
Were empty. The former and the latter occupied opposite halves of 
the cord, and were not intermingled. In the femoral cord, the 
injected trunks were one comparatively large artery, Jjth of an inch in 
diameter, with strong walls, and about eighteen smaller ramuscules of 
between a half and a third the diameter of the large one. The 
un-injected trunks were of a similar size. 
In the brachial cord there was a precisely similar arrangement ; 
but the small branches were rather more numerous, 
I am not aware that any rete mirabile has yet been observed 
having the arrangement just described ; and it would be a matter of 
much interest to work out the details of the angeiology of this 
animal in a specimen better fitted for investigation. 
The kidneys (fig. 11, AK) are situated in the lumbar region, 
immediately below the diaphragm, the right being higher than the left 
by half its length. Each kidney is 0°7 in. long by 0°35 in. wide, and 
is shaped much like that of Man. In vertical and longitudina] 
section it exhibits but a single papilla. The ureters open into the 
bladder about half an inch above its urethral aperture, and 2 inches 
from its summit. The bladder is, thus, in its empty and flaccid 
condition about 2°5 inches long. 
The suprarenal bodies (SR) are oval, o-4 inch long, and are 
attached to the front and upper faces of the kidneys. 
The testes (fig. 11, T) are large for the size of the animal, each 
being 0'7 inch long by o'4 inch wide, without the epididymis, which is 
proportionately developed. The inguinal canal is open, so that a 
blowpipe can ‘be passed into it and the peritoneal sac inflated. The 
thick vasa deferentia pass through it, and then curving over the 
obliterated hypogastric arteries (which can be traced up to the summit 
of the bladder), they bend down behind the bladder and become 
closely connected together. They terminate in the urethra by two 
apertures placed close together, upon the end and rather the under 
surface of a papilla-like colliculus seminalis, which is slightly bifid 
at its extremity (fig. 12, B). 
At first I took the notch which causes this appearance for the 
mouth of an uterus masculinus, which I imagined might lie on the 
elevated ridge which extends between the apertures of the vasa 
deferentia and those of the ureters ; but careful examination did not 
reveal the existence of any such structure. Two longitudinal folds of 
mucous membrane, along which the apertures of the prostatic ducts 
(Pr, fig. 12, B) are situated, extend from the colliculus and form 
the lateral boundaries of a wide fossa, which it overhangs. This 
fossa receives at its upper and back part, by two separate apertures. 
VOL. II RR 
