1862. 
1903. 
1904. 
1904. 
1905. 
1906. 
GORILLA 211 
Slack, in Proceedings of the Academy of Natural Sciences of 
Philadelphia. 
GORILLA CASTANEICEPS first described in the genus Troglodytes, . 
from a cast of the head. 
Matschie, in Sitzungsberichte Gesellschaft Naturforschender 
Freunde, Berlin. 
GORILLA BERINGERI first described. 
Matschie, in Sitzungsberichte yicatrr ee Naturforschender 
Freunde, Berlin. 
Gorilla gorilla diehli first deaetibad as Gorilla diehli. 
Rothschild, in Proceedings of the Zoological Society of London. 
Gorilla gorilla matschie first described, and a review of the 
species and races as recognized by the Author. Two species 
are accepted, G. GcorILLA with the following races: G. g. 
matschie; G. g. diehli; and G. BERINGERI from German East 
Africa. G. castaneiceps Slack is considered an aberration of 
G. GORILLA. 
Matschie, in Sitzungsberichte Gesellschaft Naturforschender 
Freunde, Berlin. 
Gorilla gorilla jacobi first described as Gorilla jacobi. 
Rothschild, in Proceedings of the Zoological Society of London. 
In this paper a résumé of recently received skins and skulls of 
Gorilla is given, with comparative measurements of the crania 
of the single species G. GoRILLA and its four races: diehli, ber- 
ingeri, jacobi and matschie, showing how greatly they vary from 
each other. Unfortunately this comparison was not continued 
to show how greatly the crania of the individuals of each form 
also differed from each other. In order to account for these 
races of Gorilla being found in Cameroon the Author supposes 
they cannot swim and therefore the races are separated and 
entirely isolated by the large rivers. This is a view taken from 
Selenka, in defense of his creating various species of Ourang, 
but, as in Selenka’s case, no proofs whatever, either of the 
Gorilla’s lack of ability to swim or of its confinement to 
certain districts is forthcoming, and it may be considered 
exceedingly doubtful if this Ape is restricted in its wandering 
“as if on islands,” for the ‘dry seasons’ in tropical lands reduce 
the volume of water in the rivers to such a degree as to dis- 
close their beds in many places, even sometimes of the largest 
streams, thus affording an easy passage from one bank to the 
other. 
