1906.] CRUSTACEA OF THE THIRD TANGAXYIKA EXPEDITIOjST. 187 



2. Zoological Results of the Third Tanganjdka Expedition, 

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

 Report on the Macrurous Crustacea. By W. T. 

 Calman, D.Sc, British Museum (Natural History). 



[Received Pebruarj- 5, 1906. ] 

 (Plates XI.-XIY.*) 



i. Introduction. 



The collection of Macrurous Crustacea obtained by Dr. Cun- 

 nington from the lakes of Central Africa comprises thirteen 

 species, of which only three have been previously described. In 

 Nyasa and Victoria Nyanza only a single species was found, a 

 common and widely-distributed form, already recorded from the 

 latter lake. In Tanganyika, in addition to the two species dis- 

 covered by Mr. Moore, Dr. Cunnington has been fortunate enough 

 to find no less than ten new species, and among them representa- 

 tives of what I regard as two new genera. The following is a list 

 of the species obtained : — 



Nyasa. 



Garidina nilotica, var. gracilipes (de Man). 

 Tanganyika. 



Palcemon moorei Caiman. 

 Limnocaridina retiarms, n. sp. 

 ,, parvula, n. sp. 



,, tanganyikce Caiman. 



,, similis, n. sp. 



„ latipes, n. sp. 



,, socius, n. sp. 



,, spinipes, n. sp. 



Caridella cunningtoni, n. g. et sp. 



,, mimtta, n. sp. 

 Atyella brevirostris, n. g. et sp. 

 ,, longirostris, n. sp. 

 Victoria Nyanza. 



Caridina nilotica, var. gracilipes (de Man). 



I am obliged to Dr. Cunnington for giving me his notes on 

 the occurrence and coloration of the various forms. These I 

 have incorporated in their proper places. It is right that mention 

 should be made of the excellent state of preservation of the 

 specimens, and of the very careful and methodical manner in 

 which the notes of localities and other particulars were kept. 



* For explanation of the Plates, see p. 205. 



