Zoological Society. 67 
many years ago and sold to a French captain who never returned, 
and that it was the only individual taken out of the river. From 
what I know, the young skull would very much resemble that of 
the chimpanzee. I have four crania (two male and two female), 
with many bones, though not a perfect skeleton; but I hope to 
complete one before I leave the river, and to procure a dead sub- 
ject, which I shall preserve in spirits. Great uncertainty however 
attends my success, as they are indescribably fierce and dangerous, 
and are found only far in the interior; they are killed by elephant- 
hunters only in self-defence. 
«Below you have a sketch of the cranium of the male (No. 1) 
and female (No. 2), executed for me by Mrs. Prince, the wife of 
Dr. Prince, the English Baptist Missionary at Fernando Po, who is 
here for a short time in search of health. a, a are two low ridges 
converging as seen in the sketch, and uniting at 2, and forming a 
strong prominent ridge in the course of the sagittal suture, which 
comes into a junction with a lateral ridge, d, sent back from the 
petrous portion of such temporal bone; e is a strong fossa of tri- 
angular shape between the ridges a, a. ‘The space between the 
zygoma and temporal bone in a transverse direction is 13 inch deep ; 
the diameter from before backwards 3 inches; at 06 is a sinus 
about half an inch in depth and an inch in length, with foramina 
for the passage of blood-vessels and nerves. The two upper middle 
incisor teeth are absent, but their sockets show their size to have 
been nearly if not quite double the two outer ones. The two lower 
middle incisor teeth are narrower than the two outer. 
«The female cranium is a full-grown one, but differing from the 
male in the prominence of the ridges, the two anterior corresponding 
to a, a in the male, and the central are rudimental only, except at the 
extremes of the latter where it joins the posterior transverse ridge, 
lettered din the male. It has lost the two middle upper incisors, which 
bear the same relation in respect to size to the two outer that those of 
the male do. All the incisors both in the upper and lower jaw are 
larger than they are in the male. The canines in the female are 
shorter than in the male. ‘These points are all that I need specify 
to enable you to identify the crania with any in your possession. 
You will greatly oblige me by a comparison, and communicating 
the result at your earliest convenience.”’ 
Professor Owen having, at the time when he received this in- 
formation, observed in the cranium of a young but nearly adult 
Troglodytes niger that the canine teeth presented the same sexual 
superiority of development * as in the orang’s (Pithecus), believed 
it possible that the marks of distinction mentioned by Dr. Savage 
might prove to be the fully developed characteristics of old and 
powerful males of the Troglodytes niger; and in the absence of 
means of making comparisons of other characters, besides superior 
size, longer and larger canine teeth, and concomitant strong sagittal 
and lambdoidal criste, he had deemed it better to communicate 
* Odontography, pl. 118, 119, fig. 1. 
5x 
/ 
