APPENDIX. 237 



7. CLIONA HOWSEI, Hancock. 



Cliona Hou-sei, Hancock. L. c., vol. iii, p. 336, pi. xiv, fig. 8 ; 

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



Spicula of three kinds, the first spinulate, about 

 yj^th of an inch long, very delicate, generally straight, 

 with the 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 e~o (jth 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 Null ipore from 

 the Northumberland coast (Mr. Howse). 



8. CLIONA ALBERT, Hancock. 



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



xix, p. 11. 

 Idomon Alderi, Gray. Proc. Zool. Soc., 1867, p. 526. 



Spicula of two kinds, the first spinulate, yrg-th 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. 



