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Show 534 DR. J. E. GRAY O N SPONGES. [May 9, ** Flukes divided into several palmate hooks. 5. GRAPELIA. Sponge ? Spicules inequianchorate, in circular groups ; the flukes divided into several unilateral palmate hooks. GRAPELIA AUSTRALIS, Bowerb. B. S. f. 135. Hab. West Australia. II. Defensive spicules unilateral bipolicated and inequianchorate, free in the sarcode. 6. ALEBION. Sponge branching, anastomosing; branches compressed, corymbose, rather hispid or parasitic. Spicules:-1. Inequianchorate, bidentate. 2. Needle-like, spined. 3. Cylindrical, slender, flexuous. 4. Equianchorate, bipolicated. ALEBION HYNDMANI. Halichondria hyndmani, Bowerb. B. S. p. 264, f. 123-127. See also- ?Alebion ?australis, Bowerb. ib. f. 131-134. Hab. West Australia. With tripolicated unilateral spines. 7. IOPHON. Sponge parasitic, smooth. Oscules dispersed. Skin spiculose. Spicules:-1. Fusiform, cylindrical, spined. 2. Simple, bipolicated, anchorate. 3. Inequianchorate, dentate, palmate, and bidentate. 1. IOPHON SCANDENS. Halichondria scandens, Bowerb. B. S. ii. p. 259. 2. IOPHON NIGRICANS. Halichondria nigricans, Bowerb. ib. p. 266, f. 282. III. Defensive spicules unilateral, equianchorate, free in the sarcode. * Flukes divided into two or three spines at each end. 8. ISODICTYA, sp., Bowerb. B. S. i. p. 19/. Sponge sessile, minutely hispid, regularly reticulated. Spicules of three kinds: - 1 . Needle-shaped, fusiform. 2. Bihamate, bicalca-rate (Bowerb. f. 121). 3, Equianchorate or palmate. ISODICTYA NORMANI, Bowerb. ib. ii. p. 320, f. 121, 376 (type). See also- Isodictya edwardsii, Bowerb. ib. p. 325. I. paupera, Bowerb. ib. p. 328. /. palmata, Bowerb. ib. p. 311. |