GORILLA 211 



1862. 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. 



1903. Matschie, in Sitzungsberichte Gesellschaft Naturforschender 

 Freunde, Berlin. 



Gorilla beringeri first described. 



1904. Matschie, in Sitzungsberichte Gesellschaft Naturforschender 

 Freunde, Berlin. 



Gorilla gorilla diehli first described as Gorilla diehli. 



1904. 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. gorilla 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. 



1905. Matschie, in Sitzungsberichte Gesellschaft Naturforschender 

 Freunde, Berlin. 



Gorilla gorilla jacobi first described as Gorilla jacobi. 



1906. Rothschild . in Proceedings of the Zoological Society of London. 

 In this paper a resume 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 diflfered 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. 



