45l Mr. J. E. S. Moore. Zoological Evidence for the 



II. That among the invertebrate population of Tanganyika there 

 are a large number of widely separated animal types, all of which 



FlG-. 1. — Shell of Bythoeeras iridescens obtained living near Sumbu, Tanganyika. 



at a depth of 680 ft. 



Fig. 2. — Shell of Bathanalia Howesii, obtained near Mleroes, Tanganyika, at a 



depth of 950 ft. 



possess the same quasi-marine affinities. Thus I found that among T 

 the Crustacea there are two forms of prawns and one deep-water 

 crab. Among the Hydrozoa the already known medusa Limnocnida. 

 Among Porifera one deep-water sponge ; and lastly there are several 

 forms of Peridinea and Condylostoma among the Protozoa. A large 

 proportion of these organisms are exceedingly peculiar ; but others 

 such as the two prawns, the deep-water crabs and sponge, and pos- 



