)24 



On Two African Freshwater Sponges. 



S. cerehellata has been recorded from Central India. If 

 Dr. Annandale is riglit in regarding tiiis species as a form 

 of S. lacustris, then the two commonest European species, 

 E. fluviatilis and 8. lacustris, have to be added to the list of 

 African freshwater sponges, of which twenty-one species are 

 now known. 



A description of the new variety of E. fluviatilis is given 

 below. 



^ -^ ^r«p 



Fig. 1. — Ei^hyclatiajluviatilis, var. capensis, on reed, nat. size. 



Fig. 2. — Gemmule. 



Fig. .3.— Oxea. 



Figs. 4, 5. — Smooth and spined tornotes. 



Figs. 6, 7. — Aniphidisks. 



Fig. 8. — End view of same. 



Fig. 9. — Oxea oi E.Jluviatilis from Thames, London. 



Figs. 10, 11.— Amphidisk from Thames specimen, side and end view. 



Ephydatia fluviatilis , Linn., var. capensis^ nov. 



Sponge encrusting ; colour, alive or in alcohol^ of a medium 

 brown ; surface in part smooth and uniform, in part pitted 

 and finely hirsute. Oscules scattered, level with surface, 

 inconspicuous, about 1 to I'D mm. in diameter. Flagellated 

 chambers small, oval, 20x 16 [x. 



Gemmules large, oval, "75 mm. in length by '54: mm. in 

 breadth, with funnel-shaped tube opening flush with tiie 



