234 APPENDIX. 



2. ClilONA GORGONOIDES, HoncOcJc. 



Cliona gorgonoides, Hancock. L. c, vol. iii, p. 332, vol. lix, p. 9. 



Spioula spinulate, -g\th of an incli long ; head oval, 

 frequently at some little distance from extremity. 



" A critical species, and is probably a mere variety 

 of C. celata " (Hancock). 



Abundant, riddling species of limestone on the 

 Northumberland Coast. 



3. Cliona Noethumbrioa, Hancoch. 



Cliona Northvmbrica, Hancock. L. c, vol. iii, p. 336; vol. xix, 



p. 9, pi. vii, fig. 1. 

 Pione Northumhriea, Gray. Proc. Zool. Soc, 1867, p. 525. 

 Cliona Northumbrica, Carter. Ann. Nat. Hist., eer. 4, vol. v 



(1870), p. 75. 



Sponge pale ochreous yellow (when dry), Spicula 

 of three kinds, the first much the largest, measuring 

 -yVth of an inch long, spinulate, straight, sharp-pointed ; 

 head large, round and terminal : the second acerate, 

 scarcely more than one-fourth the length of the first, 

 rather stout, much and suddenly bent in the middle, 

 both ends sharply pointed, and when viewed through 

 a one-sixth inch object glass, is seen to be minutely 

 spinous : the third form is very minute, tsVo*!^ 

 of an inch long, cylindrical, bent sharply in the 

 centre, and apparently smooth under the one-sixth 

 object glass, though occasionally there are slight 

 indications of spines; the extremities are recurved, 

 slightly enlarged and rounded. 



The second and third forms of spicules are more 

 numerous than the first, which is most abundant in 

 the papillge. 



