TWO NEW SPONGlLLiE FROM LAKE TANGANYIKA. 471 



A Description of Two New Species of Spongilla 

 from Lake Tanganyika. 



By 

 Richard Evans, B.A. 



With Plates 37 and 38, 



Contents. 



I. Introduction .... 



II. Description of Spongilla moorei 



(1) Habits of growtli and external form . 



(2) Skeleton .... 



(a) Spicules 



(b) Arrangement of spicules to form fibres, &c. 



(c) Spongin 



(3) Canal system 

 (4j Gemmules .... 



III. AfiSnities of Spongilla moorei . 



IV. Description of Spongilla tanganyikse . 



(1) Skeleton .... 



(a) Spicules 



(b) Arrangement of spicules, &c. . 



(c) Spongin 



(2) Gemmules .... 

 V. AfiBnities of Spongilla tanganyikse . 



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I. Introduction. 



The two species of Spongilla described in this paper were 

 collected by Mr. J. E. S. Moore, of the Royal College of 

 Science, during his visit to Lake Tanganyika, in the summer of 

 1896, and were taken at a depth of 350 fathoms. 



Mr. Moore entrusted the material in question to Mr. E. A. 



