Habits and Osieology of a New Orang. 429 
vomer in the Engé-ena is thin and delicate, and articulates 
imperfectly with the palatine bones, the reverse condition exist- 
ing in the second. 
If the length of the bony roof of the mouth compared with 
its breadth is an index of inferiority, the Engé-ena certainly 
occupies a lower position in the animal Fits than the Chim- 
panzée ; in the latter the breadth is to the length as 1.5 inches 
to 2.8 inches, and in the former as 1.5 inches to 3.9 inches. 
The incisive canals, which in the Chimpanzée open into the 
mouth by two distinct orifices, in the Engé-ena are but imper- 
fectly separated from each other at their termination ; a single 
oramen on each side exists midway between the incisive fora- 
men and the edges of the alveoli laterally, which is represent- 
ed in the Chimpanzée by two or more smaller foramina on 
each side. 
After the cranial crests and ridges there is no one character 
by which the head of the new. species may be more easily dis- 
tinguished from that of the Chimpanzée than by the zygomatic 
arches. In the latter they are thin and slender, especially at 
their posterior part, and the superior edge is very nearly hori- 
zontal. In the new species the arches are much broader, more 
Massive, at their posterior third suddenly arched upwa, e 
the Zygomatic fossæ much deeper ; a well marked E 
indicates the attachment of the strong masseter mu | 
= Tespects they resemble. the emitting varii of the 
satyrus.’ 
pr of the. male € crania only was in a condition to permit. 
an examination of its cavi Supe 
bees galli existed, e =e plates of the 
= g ove the plane of the cribriform. 
plate $ the os eim enclosed t Between: gem a de de- 
