| OCR Text |
Show 538 DR. J. E. GRAY O N SPONGES. [May 9, **** Defensive spicules oblong, boat-shaped, concave on the sides. 22. NAVICULINA. Sp0nge 1 Spicules:-1. Equibianchorate, unilateral, oblong, concave, with a marginal rib on each side, and sometimes a central keel-like one, abundant on membane near fascicules of slender spicules. 2. ? NAVICULINA CLIFTONI. Hymedesmia, sp., Bowerb. B. S. i. p. 252, f. 152. Hab. West Australia, Freemantle (Clifton). IV. Defensive spicules equibihamate, compressed, with a sharp edye, hooked at each end, free in sarcode. 23. HAMACANTHA. Sp0nge ? Spicules of two kinds : - 1 . Needle-shaped, slender. 2. Equibihamate; hooks and inner edge of shaft sharp-edged. HAMACANTHA JOHNSONI. Halichondria johnsoni, Bowerb. B. S. i. pp. 35, 127, f. 112, 293. Hab. Madeira. V. Defensive spicules bihamate, simple, or contorted, without any bianchorate ones intermixed. 24. GELLIUS. Sponge massive, minutely hispid. Skeleton regularly netted. Spicules of two kinds:-1. Fusiform. 2. Bihamate, simple, and contorted. 1. GELLIUS JUGOSUS. Isodictya jugosa, Bowerb. B. S. ii. p. 296. 2. GELLIUS ROBUSTUS. Isodictya robusta, Bowerb. ii. p. 304. 25. BlEMNA. Sponge massive. Skin rough, spiculose. Skeleton irregularly netted ; fibres composed of longitudinal dispersed spicules, covered with a thin coat of horny matter. Spicules : - 1 . Fusiform. 2. Bihamate, simple, or contorted and reversed. BlEMNA PEACHII. Desmacidonpeachii, Bowerb. B. S. p. 349. See also- Desmacidon constrictus. |
