1902-3.] Abdominal Viscera, of Cercocebus fuliginosus, etc. 531 
the visceral surface. The umbilical fissure extends across the 
visceral surface from the region of the portal fissure, cuts the 
margo acutus, and passes for a short distance on to the ventro- 
lateral surface. Because of the extensive overlapping of the right 
central by the left central lobe, the gall-bladder appears to lie in a 
part of the umbilical fissure. 
There is a linear indentation — it can scarcely be called a fissure 
in the usual acceptance of the term — crossing the right central 
lobe from the cystic fossa to the right lateral fissure ; and a 
Fig. 5. 
corresponding indentation, at the same level, cutting the surface 
of the left central lobe from the umbilical fissure to the left lateral 
fissure. Perhaps these may be considered as homologous with the 
groove in the liver of Cercocebus , which has been already com- 
pared with Thomson’s fissure “f” (20). The fact that these 
grooves are present in a position corresponding to the angle formed 
by the cephalic and ventro-lateral surfaces, may possibly account 
for their presence. They may be due to the curving of the liver 
upon itself. If so, their morphologic status is only subsidiary. 
Because of the greater completeness of the fissures, all the lobes 
