1*8 



THE TANGANYIKA PROBLEM. 



Brachyura. 



1. Limnothelphusa maculata (Cunnington) 



2. Platythelphusa armata (Milne Edwards) 



CRUSTACEA. 



ATYID/E. 



3. Limnocaridina Tanganyika (Caiman) 



Pal.emonid.e. 

 4. Palremon moorei (Caiman) 



I. Arachnoidia lankesteri (Moore) 



1. Lemnochnidia. 



1. Spongilla tanganyikae Evans. 



2. ,, moorei Evans. 



POLYZOA. 



IIYDROZOA. 



SPONGES. 



i 3. Potamolepis weltneri Moore. 



Associated with the above there are in Tanganyika some 

 conspicuous Protozoa, chief among which is a curious peri- 

 dinia-like form possessing cilia. This organism forms the 

 yellow scum on the lake which was noticed by Livingstone 

 in his last journey. Associated with it there is a large 



