100 On new African Freshwater Sponges. 
S. indica, S. graveleyt, and S. sumatrana. All these possess 
microspined macroscleres, spined microxea, and strongylous 
gemmule-spicules. Apart from other characters, all these, 
except S. indica, are clearly marked off from the new species 
by the possession of oxea as macroscleres. 8S. indica, like 
S. benguelensis, sp. n., possesses stronglya as macroscleres, 
but is separated from it by yarious differences in the size and 
character of the spicules, and particularly by the structure of 
the gemmules, which in S. indica are fixed to the substratum 
by their outer chitinous membrane and are not enclosed in 
cages of macroscleres. 
A sponge belonging to another genus—namely, Corvo- 
spongilla micramphidiscoides, Weltner—has a very similar 
spiculation, but with the addition of free amphidiscs, the 
possession of which characterizes the genus. 
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(6) ‘‘Etude monographique des Atheriide,” Ann. Soc. roy. zool. et 
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JAFFE, G. 
(7) ere! oe aus dem Tanganjikasee,” Zool. Anz, xlviii. 
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