304 PEOF. F. J. BELL ON A NEW SPECIES OP CIDAEIS. 



those nearest the mouth. It is usual for all to have the form and coloration already 

 described ; but those nearest the mouth are more spatulate in form than the rest. 



The secondary spines are crowded in great quantities round the bases of the 

 primaries and in the ambulacral areas ; they are sharply pointed, and creamy or 

 yellowish in colour. The apical area is very extensive and about half the diameter of 



the corona. * 



With regard to the affinities of this species it is not possible to say much. The 

 amount of ostracum seen in transverse sections of the spines is slight, and there are 

 no swellings, transverse crowns, or ridges, and no parasitic deposits. The long simple 

 spines with striae appear to be most like those members of the genus which have been 

 distinguished as Borocidaris. 



A number of, as I think, very unnecessary genera have been founded for various 

 examples of Cidaris ^ To Cidaris in a wide sense there is no doubt that the present 

 specimen belongs, and I do not expect that the investigation of the denuded test will 

 lead to the establishment of any new generic division for it. From the characteristic 

 shape of the spines I propose to call it Cidaris curvatis]pinis. 



EXPLANATION OF PLATE XXXVIII. 



Cidaris curvatispinis, from a photograph, reduced to two-thirds of the natural size. 



' Cf. Catal. Brit. EcMnodermB Brit. Mus. (1892), p. 139. 



