224 PSEVDOGORILLA 



GENUS in. PSETTDOGORIILA. 



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 Pongiidae, 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. 



