18G7.] DR. J. E. GRAY ON SPONGES. 519 



R. semitubulosa, O. Scbinidt, ib. p. 7o. 1 Spongia semitubiilosa, 



Lanik. B.M. 



R. luxurians, O. Schmidt, ib. p. 7&. B.M. 



2. Halichondria. 



Skeleton irregularly netted, scattered, or reticulated. Spicules 

 uniform, fusiform. 



Halichondria panicea, Johnston; Bowerb. Brit. Sp. p. 229, 

 f. 300, 303. 



See also — 



//. servosa, Johnston. 



H. glabra, Bowerb. ib. p. 232. 



//. caduca, Bowerb. ib. p. 234. 



//. incotispicua, Bowerb. ib. p. 23d. 



H. incerta, Bowerb. ib. p. 237. 



H. coalita, Johnst. t. 12. f. 1 ; Bowerb. ib. p. 238, 



H. simplex, Bowerb. ib. p. 240. 



H. subdola, Bowerb. ib. p. 247. 



H. /armaria, Bowerb. ib. p. 269 (spicules spined). 



H. distorta, Bowerb. ib. p. 240 (spicules fusiform and needle-like). 



3. DiCTYOCYLINDRUS. 



Sponge arborescent ; branches large, forked, rather hispid ; skin 

 without spicules. Skeleton of fasciculated spicules. Spicules : — 

 • 1. Needle-shaped or fusiform, long, slender. 2. Needle-like or sub- 

 pin-like, spinose. 



Dictyocylindrus, Bowerb. B. S. i. p. 18.5. 



1. Dictyocylindrus hispidus, Bower. B. S. i. p. 185, ii. p. 108. 

 Spongia hispida, Mont. 



2. D. ventilabrum, Bowerb. ib. ii. p. 100, f. 66. 



3. D. ramosus, Bowerb. ib. ii. p. 103, f. 366. 



4. D. puMiLus, Bowerb. ib. ii. p. 114. 



5. D. RUGOsus, Bowerb. ib. ii. p. 119, f. 369. 

 And other species described by Dr. Bowerbank. 



4. x\aptos. 



Sponge fleshy, internally spiculose. Spicules all needle-shaped, 

 elongate, smooth (no anchorate spines, or globules, or stars). 



Aaptos adriatica. B.M. 



Ancorina aaptos, O. Schmidt, Supp. i. p. 33, t. 4. f. 4. 

 Hab. Adriatic. 



