1867.] DR. J. E. GRAY ON SPONGES. 549 



Spicules: — 1. Fusiform, with blunt ends. 2. Stellate, with small 

 centre and long cylindrical blunt rays. 3. Stellate, spherical ; body 

 large ; rays numerous, short, broad, conical ; the rays often show a 

 central line. 



2. Tethea ingalli, Bovverb. ib. i. pp. 51, 52, f. 161, 164. 



Hab. . 



Spicules stellate : — 1 . Rays few (seven or eight), cylindrical, blunt, 

 larger than the small central body. 2. Rays far apart (eight or 

 nine), conical, acute, about as long as the diameter of the central 

 body. 



II. Ovisacs scattered in the flesh and outer surface of the sponge. 



4. Erylus. 



Sponge expanded, mammillated, ending in an oscule. Spicules of 

 three kinds: — 1. stellate; 2. ternate, rays forked; 3. subcylin- 

 drical, waved. With oblong ovisacs, formed of claviform spines. 



Erylus mammillaris. 



Stelletta mammillaris, O. Schmidt, p. 48, t. 5. f. 1. B.M. 



5. Triate. 



Sponge irregular, tuberose. Spicules of two kinds : — 1. stellate; 

 2. ternate, with rays forked. Ovisacs roundish or elliptical, formed 

 of claviform spines. 



Triate discophora. 



Stelletta discophora, O. Schmidt, p. 47, t. 4. f. 5. B.M. 



(See also Bowerb. B. S. f. 50, 51.) 



6. Caminus. 



Sponge globose, with a large single subcentral cavity. Bark 

 netted. Spicules cylindrical, filiform, blunt at the end. Ovisacs ob- 

 long, elliptical. 



Caminus vulcani, O. Schmidt, p. 48, t. 3. f. 27, t. 4. f. 6. 

 Hab. Adriatic Sea. B.M. 



Fam. 2. Placospongiad^. 



Sponge branched, coral-like, with a central axis and a hard outer 

 coat entirely formed of solidified ova. The axis and outer lamina 

 separated from each other by a layer of sarcode, strengthened with 

 bundles of spicules. 



Placospongia, Gray, P. Z. S. 1867. 



Placospongia melobesioides. Gray, P. Z. S. 1867, p. 128 

 (cum fig.). 

 Hab. Borneo. 



