512 DR. J. E. GRAY ON SPOXGKS. [May 9, 



1. Chalina, Bowerb. B. Sp. i. 208. 



Sponge branched, pabiiate, or inosculated. Skeleton of solid cylin- 

 drical horny fibres, with small imbedded spicules. Spicules fusiform 

 or needle-like, slender, and thick. 



Chalina oculata, Bowerb. B. Sp. p. 3G0. f. 2G2. 



Spongia Iccvujata, Montag. 



JIalichondria oculata, Johnston. B.M. 



See other species described by Dr. Bowerbank (Brit. Sp. p.3Gl). 



2. Isodictya. 



Network of sponge symmetrical, with radiating and transverse 

 lines of fusiform needle-like spicules. Spicules fusiform or needle- 

 shaped. The ovisac internal, membranaceous, not spinose. 



Isodictya, Bowerb. B. Sp. i. p. 197; ii. p. 9 ; O. Schmidt, Spon. 

 Adriat. Supp. ii. p. 17. 



Reniera, sp., Nardo; O. Schmidt. 



* Spicula fusiform, smooth. 



1. Isodictya cinerea, Bowerb. B. Sp. ii. p. 27. 

 Halichondria cinerea, Johnston. B.M. 

 See other species described by Dr. Bowerbank (B. Sp. pp. 275 and 



following). 



** Spicula needle-like, spinose, fexuous. 



2. Isodictya lurida, Bowerb. B. Sp. p. 33G. 

 Hab. Northumberland. 



3. Halispongia. 



Sponge massive, with a reticulated horny skeleton. The larger 

 fibres with irregularly dispersed internal spicula; the small ones 

 without spicula. 



Halispongia, Bowerb. B. S. ii. p. 207 ; O. Schmidt, Sp. Adriat. 

 Supp. ii. p. 9 = Cacospongia, sp., A. Schmidt. 



Halispongia cavernosa. 



Hahama Sponge of Commerce, Bowerbank, B. S. i. p. 207, t. 36. 

 f. 378, ii. p. 13. 



A. AcANTHELLA, O. Schmidt, p. 65. 



Sponge branched, often spinose, flexuous ; fibres compressed ; skin 

 sunk, very porous. Spicules cylindrical, elongate, often flexuous, 

 placed longitudinally in the membranes. 



1 . AcANTiiELLA ACUTA, 0. Schmidt, p. C5, t. 6. f. 7 ; Suppl. p. 2, 

 t. l.f. 1. B.M. 



2. AcANTHELLA OBTCSA, O. Schmidt, p. C5, t. G. f. 8. 



