224 PSEUDOGORILLA 
GENUS III. PSEUDOGORILLA. 
apie Se yr, ee | 
Size small but somewhat larger than the adult Chimpanzee. 
Braincase similar to the species of Pan, being large, full and rounded, 
sagittal and occipital crests wanting; forehead, prominent rising above 
orbital ridge; a rather broad flat expansion extending from occipital 
region to root of zygoma; facial region in profile having a slant of 45° 
from orbital ridge, rostral portion protuberant, narrow, lengthened; 
anterior portion of zygomatic arch at its root only reaches the anterior 
edge of posterior molar; lower horizontal line of mandible rounded, 
not straight. 
The remarkable species of this genus exhibits affinities to both the 
Gorilla and Chimpanzees, possessing characters belonging to each. In 
size it is nearest the Chimpanzee but with a distribution of the hairy 
covering more like the Gorilla. The braincase with the prominent 
forehead and absence of crests is very like that of the Chimpanzee, 
but the rest of the cranium is Gorilla. The wide lateral and occipital 
flat expansion, shown in a most limited degree if at all in the Chim- 
panzee, the abrupt contraction of the lower facial region, very wide 
in the Chimpanzee, the lengthened narrow rostrum, like the Gorilla 
and contrasting strongly with the broad short rostrum of the species 
of Pan; the root of the zygomatic arch reaching only to the first molar 
as in the Chimpanzee ; the narrow palatal floor, and the rounded lower 
horizontal line of the mandible like Gorilla and not straight as in 
Chimpanzee, all exhibit an animal which, while possessing characters 
found in one or other of its near relatives in Pongiidze, has combined 
them in so extraordinary a manner as to entitle it to be separated 
from both and regarded as representing a distinct generic form con- 
necting the other two genera. In its habits it has some of the attributes 
of the Chimpanzee, for the Collector who obtained the specimens now 
in the Senckenbergian Museum stated that it builds a nest in trees, 
and brought one back with him, in which the baby was when he 
obtained it. The skulls from which the descriptions and comparisons 
were made are those of the Senckenbergian Museum examples. 
