1867.] DR. J. K. GRAY ON SPONGES. 545 



18. Chondrilla, O. Schmidt, S. A. p. 39 ; Suppl. i. p. 36. 

 Sponge oblong or lobed. Outer surface formed of very closely 

 compacted fibres. Spicules stellate. 



Chondrilla embolophora, O. Schmidt, p. 39, t. 3. f. 23, 23a. 



B.M. 

 Chondrilla nucula, O. Schmidt, p. 39, t. 3. f. 22, 22«. B.M. 



** Sponge branched. 



19. Stelligera. 



Sponge branched, forked, flexible ; surface stellate. Spicules 

 united by a horny substance, netted, of four shapes : — 1. Pin-shaped, 

 smooth. 2. Needle-shaped, smooth. 3. Cylindrical, elongate, blunt 

 at each end. 4. Spherical, stellate, with many acute rays (on sur- 

 face). 



Stelligera furcata. 



Raspailia stelligera, O. Schmidt, p. 60, t. 5. f. 11. 



20. ViBULINUS. 



Sponge arborescent, branched, forked and refn-ked ; surface spi- 

 culose. Spicules: — 1. Fusiform, needle-shaped, long, slender, often 

 fasciculated. 2. Stellate, spherical, or rather elongate, with nume- 

 rous acute rays, minute. 



ViBULINUS STUPOSUS. B.M. 



Spongia rigidu, Montag. 



S. stuposa, var. damicenus, Mont. 



Halichondria rigida et H. cervicornis, Johnst. 



Dictyocylindrus stuposus, Bowerb. B. S. i. p. 109, ii. p. 1 16, f. 208, 



Hab. England. 



See also — 



V. aculeaius = D. aculeatus, Bowerb. ib. ii. p. 109. 



21. Adreus. 



Sponge arborescent, branched; branches forked, smooth. Spicules 

 abundant: — 1. Needle-shaped, slender, often flexuous. 2. Needle- 

 shaped, stout, in radiating bundles. 3. Stellate, minute in the sar- 

 code. 



Adreus fascicularis. B.M. 



Dictyocylindrus fascicularis, Bowerb. B. S. ii. p. 111. 

 Hab. English coast. 



22. Axes. 



Sponge branching, reticulated. Spicules stellate, nearly uniform 

 in size, formed of two flat three-rayed stars placed one on the otlii-r 

 Proc. Zool. Soc— 1867, No. XXXY. 



