1919.] N. Annandale : Bombay Streams Fauna. i6r 



forma typica merely in slight differences in the measurements of 

 the spicules. 



var. rivularis, nov. 



(Plate VII, fig. 2). 



The skeleton-spicules are stouter and as a rule less sharply 

 pointed than in the forma typica ; the gemmule-spicules are rela- 

 tively longer, more variable and often more irregular in outline ; 

 the skeleton is less compact ; the gemmules are either free or 

 fixed by means of their outer spiculiferous coat at the base of the 

 sponge. 



Type-specimen. — P 66/ r Zool. Survey of India {Ind. Mus.). 



Locality. — Rocks in the river Yenua at Medha. 



I could not distinguish living specimens fiom S. perviridis, side 

 by side with which they were growing. 



var centralist nov. 

 (Plate VI, fig. 3 ; plate VII, fig. i). 



The skeleton-spicules, though remaining long and relatively 

 slender, are for the most part distinctly blunt at the tips. Other- 

 wise the form resembles the var. rivularis. 



Type-specimen. — P 71/1, Zool. Survey of Tndia {Ind. Mus.). 



Locality. — Rocky bed of a stream at Chakradharpur, Chota 

 Nagpur. 



var. indica, Annandale. 



(Plate VII, fig. 3). 



igo8. Spongilln iiufica, Annandale, Rec. Ind. Mus., II, p. 25, figs, i, 2. 

 igii. Spongilla indica, id., Faitii. Brit Ind., torn, cif., p. loo, fig. 17. 



Most of the skeleton-spicules are blunter and shorter than in 

 the last variety ; the gemmule-spicules are on an average much 

 smaller and more slender ; the skeleton is more compact and the 

 gemmules are as a rule fixed at the base of the sponge. 



Localities. — Nasik and Igatpuri in the Nasik district, Bombay. 



var. graveiyi, Annandale. 



1912. Spongilla gravelyi. Annandale, Rec. Ind. Mus., VII, p. 385, fig. i. 



The skeleton-spicules are relatively long, slender, sharply 

 pointed and sparsely spined ; the gemmule-spicules have a pecu- 

 liar curvature and are often knobbed at the end ; the gemmules 

 are free. 



Locality.— KoyndL river at Taloshi, Satara district, Bombay. 



In distinguishing these varieties reference should be made to 

 the figures here reproduced or cited. I have avoided giving 

 detailed descriptions as it is possible that intermediate forms exist 

 and it seems best in dealing with the varieties of a plastic species 

 not to be too exact. 



