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Show 536 DR. 3. E. GRAY ON SPONGES. [May 9, H. albula, Bowerb. ib. p. 268. H. irregularis, Bowerb. ib. p. 252. H. dickiei, Bowerb. ib. p. 253. H. 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 spiculose. Spicules of four kinds:-1. Fusiform, large. 2. Equianchorate, 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. Hymeniacidon 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 SHADBOLT1I. 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 (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. HAMIGERA. Sponge thick, subgiobose. Pores in sunken oscule-like spaces. Spicules of two kinds:-1. Simple. 2. Equibianchorate, with three spines at each end. HAMIGERA 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 |