1867.] dr. j. e. gray on sponges. 535 



9. Emplocus. 



Sponge iiicrusting, parasitic on Sertularia. Spicules of four 

 kinds: — 1. Cylindrical, pin-shaped, both ends truncated, torn, 

 smooth. 2. Cj'lindrical, slightly tubercular, with one or three di- 

 verging conical points at one end, and irregularly truncated at the 

 other, 3. Cylindrical, curved, rather swollen, rounded at the ends, 

 with two elongate spines at each side of ends. 4. Ec^uibianchorate, 

 two-pointed at each end. 



Emplocus tridens. 



Myxilla tridens, 0. Schmidt, Supp. t. 4. f. 5. B.M. 



10, Anchinoe. 



Sponge-coating thin, smooth. Oscules slightlj'^ elevated. Skin 

 spiculose. Spicules: — 1. Fusiform, large, long. 2. Clavate, slender, 

 entirely spined, of various sizes. 3. Equianchorate, bi-- or trideutate. 



Anchinoe perarmatus. 



Hymeniacidon perarmatus, Bowerb. B. S. p. 164, 



11, Microciona, part., Bowerb, ib. i. p. 188, ii, p. 124. 



Sponge thin ; coating with columns of spicules that radiate from 

 the axis in every direction. Spicules of three kinds : — 1 . Subclavate. 

 2, Needle-shaped, spined. 3. Equianchorate, bidentate (or dentato- 

 palmate), 



Scopalina, O. Schmidt. 



Microciona spinulenta, Bowerb, B, S. p. 132, 



See also — 



M. armata, Bowerb. ib, p. 129. 



M.fictitia, Bowerb. ib, p. 124. 



M. carnosa, Bowerb. ib. p. 133. 



M. atrosangninea, Bowerb. ib, p, 138. Scopalina lophyropoda, 



0. Schmidt. B.M, 

 \M. ambigua, Bowerb, ib, p. 136 (end of anchorate spicules 



sometimes dentato-palraate). 



12. Dendoryx, 



Sponge massive, irregularly reticulated. Spicules of four kinds : — 



1, Fusiform or cylindrical, pointed at each end, smooth. 2. Needle- 

 like, spinulose all over, 3. Equibianchorate, threespined at each 

 end. 4. Bihamate. 



Dendoryx incrustans, 



Halichondria incrustans, Bowerb. ib. p. 249, f. 28, 92, 110, 111, 

 373 ; O. Schmidt, Supp, ii. t, 1. f, 17. 

 See also — 

 H. thompsoni, Bowerb. B. S. p, 243, 



