262 DR. W. A. CUNKINGTON ON 



21. Zoological Results o£ the Third Tanganyika Expedition^ 

 conducted by Dr. W. A. Cunnington, 1904-1905. 

 — Report on the Branchinra. By William A. 

 Cunnington, M.A., Ph.D., F.Z.S. 



[Received February 11, 1913 : Read March 4, 1913.] 



(Plates XLI.-XLY.*) 



Index. 



Systematic : 1 ^S^ 



Argulus: Key to African Species of 267 



Arc/ulus incisus, sp. u 268 



A. ruhropunctatus, s\).n 269 



A. personatus, S'p. n 271 



A. exiguus, ^T^. n 272 



A. anffusticeps, sp. n 273 



A. striatus, sp. n 274 



A. rubescens, sp. n 276 



Distribution, Table of 280 



1. Introduction. 



Through the collections made by Stuhlmann in Lakes Victoria 

 Nyanza and Albert Edward Nyanza, and by Fiilleborn in 

 Lake Nyasa, we have for some time known of the existence of 

 Argulidse in the waters of those lakes. The material collected 

 during the Third Tanganyika Expeditioii proves that these 

 parasitic copepods also occur commonly in Tanganyika, from 

 which lake, indeed, far more species are now known than 

 from any of the other great African lakes. As many as 

 363 specimens were obtained by this Expedition, the great 

 majority of them from Tanganyika, with a few from Victoria 

 Nyanza. There are nine species represented in all, and it is 

 interesting to remark that, while two species — both previously 

 described — were found in Victoria Nyanza, the same two forms 

 were associated with no fewer than seven new species in Tan- 

 ganyika. 



Since the return of the Expedition there have come into my 

 hands specimens of Argulids from Nyasa and from Albert 

 Nyanza ; and as these constitute new records and add to our 

 knowledge of distribution, it seems desirable to refer to them 

 also in the present paper. Including the two types collected 

 by Fiilleborn in Nyasa, the following is thus a complete list 



* For explanation of Plates, see pp. 282-283. 



