280 Description of two additional Crania of the 
concluding, that in the Engé-ena, as in Man,* the capacity of 
the cranium of the male is larger than that of the female ; 
the smallest male skull of the Engé-ena measuring twenty- 
eight cubic inches, and the female only twenty-five cubic 
inches. 
In Table IIL., the three adults are females, and it is quite 
worthy of notice, that the internal capacity of these differs so 
little from that of the female Engé-ena, while at the same 
time, the body of the Chimpanzée is so much smaller than 
that of the other species. By comparing the measurements 
given of the corresponding portions of the skeleton of the 
Engé-ena and Chimpanzée, it will be seen that a much wider 
difference exists between them, than exists between the dimen- 
sions of their respective brains. 
It is interesting to contrast the measurement of the cra- 
nial capacity of these members of the Quadrumanous group 
with that of some of the human races. It results from Dr 
Morton’s table, at page 263 of this volume, that the smallest 
mean capacity in Man is that derived from Hottentots and 
Australians, which equals only 75 cubic inches, while that of 
the Teutonic nations amounts to 90 cubic inches. The maxi- 
mum capacity of the Engé-ena, is therefore considerably less 
than one-half of the mean of the Hottentots and Australians, 
who give us the minimum average of the human races. 
Cranium 2, Male.—This cranium belonged to an indivi- 
dual much older than the one described inthe preceding pages, 
the inner row of cusps of all the molars having been worn to 
their bases. The same obliteration of the sutures had taken 
place, the malar bones are more tumid, rendering the edge of 
the lower and outer part of the orbit more rounded. The 
floor of the nasal orifice slopes gradually from the anterior 
extremity of the vomer to the edge of the incisive alveoli, and 
presenting a groove on the median line. In man, the inter- 
* « Although many female brains exceed in weight particular male brains, the 
general fact is sufficiently shewn, that the adult male encephalon is heavier than 
that of the female, the average difference being from 5 to 6 oz,” From the 
examination of 278 male brains, and 191 females, “an average weight is de-’ 
duced of 494 oz. for the male, and 44 oz. for the female.”” Quain and Sharpey’s 
Anatomy, edited by Joseph Leidy, M.D., vol. ii., p. 185, Philadelphia, 1849) 60 
4 
