Engé-ena, from Gaboon, Africa. 275 
This cranium does not agree with that figured by Professor 
Owen in his Memoir (Plate LXI.), in the exclusion of the orbits 
from view, by the prominent malar bones, when the skull is 
seen in profile, but as was the case in those discovered by 
Dr Savage, the nasal bones are wholly, and the orbit in part 
brought into view. In none of them is it more excluded 
than in the first figures of our Memoir. The great ridges 
above the orbits, which are so widely developed in 7. niger, 
are still more so in the present species, and in the specimen 
now under consideration, sustain the former statements, with 
regard to them. Professor Owen remarks, in connection 
with them—*“ The prominence of the whole supra-orbitar 
ridge, reaches its maximum in the present species, and forms 
the most marked distinction in the comparison of its skull 
with that of Man.’””—(Memoir, p. 405.) 
Sutures.—I have shewn in a former communication, from 
an examination of several crania of the Chimpanzée, that 
nearly all the sutures are completely obliterated early, dur- 
ing the adult period.* From a careful examination of the 
six crania of the Engé-ena to which I have had access, there 
is every reason to believe that an early coossification takes 
place in them also. In the skull now under consideration, 
which, it is to be remembered, has not long passed the adult 
period, the frontal, the sagittal, the coronal, the squamous 
portion of the temporal sutures, all those in the temporal 
fossa, as well as the transverse portion of the lambdoidal, are 
no longer persistent. The crania which have been examined 
_ by Professor Owen, or some of them at least, indicate an op- 
posite state of things. To ascertain, therefore, the value of 
cranial sutures as specific signs, it is quite obvious, that a 
large number crania of different ages must be critically ex- 
amined. 
Intermaxillaries.—These bones, so important as zoological 
indications, are completely coossified with the maxillaries, 
and with each other. No indication of a suture exists between 
and the last-mentioned bones, either on the external surface 
below the nasal openings, or in the roof of the mouth. I was 
* Boston Journal of Natural History, April 1843. 
