REVISION OF FRESHWATER SPONGES OF SPONGILLIDAE 61 



ranged in a tangential mosaic-like manner on inner gemmular 

 membrane; foramen recorded as depressed (Annandale). 



Distribution. — India. 



Color in life. — Recorded as bright green. 



Discussion. — Corvospongilla caunteri displays close affinities to 

 C. ultima, and the spicidar components are very similar in both 

 these species. However, C. caunteri appears to lack fixed gemmules 

 altogether, and the pneumatic coat of these bodies consists of hardly 

 discernible but nevertheless present minute air spaces. Further collec- 

 tions may yet demonstrate that this species, when fully mature and 

 large, also produces adhering gemmides. Until such additional evidence 

 becomes available, it is advisable to consider C. caunteri a distinct 

 species, since at least at present it can be easUy differentiated from 

 its closest relative, C. ultima, by several criteria. 



Corvospongilla zambesiana (Kirkpatrick, 1906) 



Spongillaf zambesiana Kirkpatrick, 1906, p. 225. 

 Corvospongilla? zambesiana Weltner, 1913, p. 475. 



Corvospongilla zambesiana Annandale, 1914, p. 245. — Gee, 1931e, p. 52; 1932c, 

 p. 27.— Arndt, 1933c, p. 309; 1936, p. 16.— Penney, 1960, p. 38. 



Material. — Slide of type specimen (BM). 



Description. — Sponge, according to Ejrkpatrick (1906), forming 

 a thick crust; surface irregular. Skeleton a dense network of very 

 thick spicule fibers. Consistency recorded as hard. 



Megascleres apparently of two different series: (1) stout and slightly 

 curved amphistrongyla, inflated at their extremities and entirely 

 smooth, forming the mass of the skeleton, and (2) a few slender, 

 curved and smooth amphioxea; length range of (1) 170-200 /x, of 

 (2) 156-175 /x; width range of (1) 20-24 m, of (2) 7-9 m- 



Microscleres represented by microbirotiilates wdth feebly curved 

 and smooth shafts, and terminally with a smaller number of sharply 

 recurved hooks; average length 35 fi, diameter of rotide 6-11 ju. 



Gemmoscleres and gemmides not observed by the authors. 



Distribution. — Zambesi River system, Africa. 



Color in life. — Not yet observed. 



Discussion. — Corvospongilla zambesiana is insufficiently represented 

 in the material available for this study, and its revision and compari- 

 son with its congeners therefore is impossible. At present, its separa- 

 tion from the C. loricata group of species appears highly difficult. 



RadiospongillUf new genus 



Spongilla Bowerbank, 1863, p. 465 (part). — Graj% 1867, p. 553 (part). — Carter^ 

 1881a, p. 88.— Haswell, 1882, p. 209.— Potts, 1887, p. 194 (part) .— Lenden- 

 feld, 1887, p. 89 (part) .— Whitelegge, 1889, p. 306.— Weltner, 1895, p. 



