536 DR. J. E. GRAY ON SPONGES. [May 9, 



H. albula, Bowerb. ib. p. 268. 

 H. irregularis, Bowerb. ib. p. 252. 

 //. dickiei, Bowerb. ib. p. 253. 

 n. pattersoni, Bowerb. ib. p. 255. 

 H. batei, Bowerb. ib. p. 261. 

 H. granulata, Bowerb. ib. p. 262. 



13. Pronax. 



Sponge sessile, rugose, and mammillated. Skin irregularly spicu- 

 lose. Spicules of four kinds: — 1. Fusiform, large. 2. Equianeho- 

 rate, ending in three more or less unequal angulated spines, arranged 

 in circular groups or dispersed. 3. Needle-like, stout, spined, rarely 

 spineless. 4. Fusiform, spined. 



Pronax plumosa. B.M. 



Spongia plumosa, Montag. 



Hytneniacidon plumosa, Bowerb. B. S. ii. p. 195, f. 141-143. 



14. EUTHYMUS. 



Sponge ? Spicules equianchorate, each end ending in three 



nearly equal-sized attenuated acute lobes or teeth. 



1. EuTHYMUS SHADBOLT5I. 



Sponge, Bowerb. ib. i. pp. 47, 250, f. 140. 



2. EuTHYMUS ? MINOR. 



Sponge, Bowerb. ib. ii. p. 250, f. 149. 



15. Desmacidon, part., Bowerb. ib. i. p. 200, ii. p. 345 (type). 



Sponge massive, hispid, irregularly netted, with large tubular 

 cloaca ; filaments with imbedded longitudinal spicules. Spicules of 

 three kinds : — 1. Needle-like. 2. Bihamate, simple, and contorted. 

 3. Equianchorate, bidentate. 



Desmacidon fructicosus, Bowerb. ib. i. p. 200, ii. p. 345 ; 

 O. Schmidt, Supp. ii. t. 1. f. 19. 



16. IIamigera. 



Sponge thick, subglobose. Pores in sunken oscule-like spaces. 

 Spicules of two kinds: — 1. Simple. 2. Equibianchorate, with three 

 spines at each end. 



IIamigera rubens. B.M. 



Cribrella hamigera, O. Schmidt, S. A. p, 70, t. 6. f. 13. 



17. Hymedesmia, part., Bowerb. B. S. 

 Sponge-coating very thin, smooth, with fascicules of spicules. 

 Spicules of four kinds: — 1. Cylindrical, slender, subclavate at each 



