APPENDIX. 237 



7. CjjIona HowsEi, Hancock. 



Cliona Howsei, Hancock. L. c, vol. iii, p. 336, pi. xiv, fig. 8 ; 

 vol. xix, p. 10, pi. vii, fig. 5. 



Spicula of three kinds, tlie first spinulate, about 

 Xo-o^li of an incti long, very delicate, generally straight, 

 witli tlie head broadly ovate, short, well-marked, ter- 

 minal, and having the narrow end at the extremity 

 and sometimes a little prolonged : the second abundant 

 and somewhat longer than the first, equally slender, 

 mostly slightly bent, and gradually diminishing to a fine 

 point at one extremity, the other extremity has usually 

 two heads, one terminal or nearly so, the second about 

 one-third down the shaft, the terminal head is frequently 

 wanting : the third is about eo^oth of an inch long, 

 rather stout, cylindrical, usually irregularly bent or 

 angulated and strongly spined with the extremities 

 obtuse. 



The sponge when dry is of a pale yellow ochre 

 colour. 



In the shell of Fusus antiquus and in Nullipore from 

 the Northumberland coast (Mr. Howse). 



8. Cliona Aldeei, Hancock. 



Cliona JJderi, Hancock. L.c, vol. iii, p. 337, pi. xv, fig. 9 ; vol. 



xix, p. 11. 

 Idomon Alderi, Gray. Proc. Zool. Soc, 1867, p. 626. 



Spicula of two kinds, the first spinulate, Treth of 

 an inch long, moderately thick, slightly bent, with a 

 small head near one end and tapering to the other 

 extremity : the second scarcely shorter than the first, 

 and has one end truncate, the other pointed, and is 

 decidedly bent in the centre. 



