240 ■'^- Annandale. 



spined gemmule-spicules ; from S. nitens, another allied form, it is distin- 

 guisliod by its very mueh sharper and more slender skeleton-spicules. 



Locality: ]{. Zambesi near the Victoria Falls; W. Michaelsen, 

 18. Anglist 1911. 



Type in the Hamburg Natural History Museum. A co-type in the 

 Indian Museum. 



Subgen. Stratospongilla, Annandale. 



This subgenu)^ is also well represented in the African fauna, to which 

 four species were hitherto known to belong. I have here to add a fifth 

 from Dr. Michaelsen\s coUection. The live species may be distinguished 

 one from another by the following key, which may be used in connection 

 with those of the Indian species given on p. 385 of Vol. VII of the Records 

 of the Indian Museum (1912) and on p. 68 of my volume in the „Fauna 

 of British India". 



Key to the African species of Strato sponffilla. 



I. Skeleton-spicules amphioxous. 



A. Skeleton-spicules rough or irregulär in outline 



1. Gemmule-spicules sausage-shaped . . . *S'. sumairana. 



2. Gemmule-spicules slender, amphioxous or 



nearly so S. homhayensis. 



B. Skeleton-spicules quite smooth. 



1. (jremmide-spicules smooth S. schuhotzii. 



2. Gemmule-spicules bearing blunt spines . S. rousseletii. 

 IL Skeleton-spicules amphistrongylous (spiny). 



Gemmule-spicules spiny, sausage-shaped, 

 cylindi-ical; gemmules enclosed in a dense 

 cage of spicules S. africana. 



Spoiifjilla africana, sp. uot. 



PI. VI hgs. 1 A— C, and 2. 



Sponge. This sj)ouge is represented by two circular lilms about 

 10 mm in diameter and not as much as 2 mm thick. They are attached 

 to a piece of stone in a dry condition. The colour is nearly white. The 

 sponge is hard but friable. Its external structure can not be clearly seen, 

 but the pores and oscula were evidently niinute and the subdermal cavity 

 seems to have been comparatively sniall. 



