1867.] DR. J. E. GRAY ON SPONGES. .")43 



** Sponge tvithout star-like spicules. 

 9. Ancorina, O. Schmidt, p. 51. 



Sponge subglobose or lobed, without any star-like spicules. Spi- 

 cules elongate, outer end two- or three-rayed, hooked, sometimes bifid. 



1. Ancorina crebra, O. Schmidt, p. 51, t. 3. f. 28. 



2. Ancorina virescens, O. Schmidt, p. 52, t. 3. f. 29. 



II. Sponge subglobose, with groups of triforhed or tricurvate spicules 

 extended beyond the surface, without any internal ti'icurvate 

 or stellate spicules. 



10. Tethya. 



Sponge oval, hispid. Skin thin. Spicules of four kinds : — 

 1. Fusiform, elongate. 2. Fusiform, three-pronged, projecting be- 

 yond the surface. 3. Bihamate. 4. Clavate, with a short conical 

 flat head, with a conical process on one side. 



Tethea, § 1, Bowerb. B. S. p. 83. 

 Ancorina, Schmidt. 



1. Tethya cranium, Lamk. 



Tethya cranium, Johnston, B. S. p. 85, t. 1. f. 1-8 ; Bowerb. B. 

 S. i. p. 183, ii. p. 83, f. 77-82, 247, 251, 252, 343, 344, 362 ; O. 

 Schmidt, Supp. ii. t. 1. f. 14. 



Alcyonium cranium, Miiller, Z. D. 



Spongia pilosa, Montag. B. S. p. 119, t. 13. f. 12. B.M. 



Hab. North Sea. 



2. Tethya simillima, Bowerb, B. S. p. 725. 

 Hab. Arctic Regions. 



III. Sponge expanded ; coating maj'inc bodies with external 

 spreading spicules with stellate tips. 



tl. Mesapos. 



Sponge-coating hispid. Spicules: — 1. Clavate, attenuated, large, 

 slender. 2. Clavate, cylindrical, smooth ; apex spinose, stellate. 



Mesapos stellifera. 



Hymeraphia stellifera, Bowerb. ib. ii. p. 146, f. 370. 



12. Laothoe. 



Sponge ? Spicules of three forms: — 1. Fusiform, verti- 

 cally spined. 2. Clavate, elongate, slender, smooth. 3. Needle- 

 shaped, inflated, smooth ; apex divided, substellate. 



Laothoe verticillata. 



Hymeraphia verticillata, Bowerb. ib. p. 145, f. 240. 



