170 



THE DEPTHS OF THE SEA. 



[CHAP. iv. 



Although 



many of the echinoderms of the cold 

 area are common to the warm, the general facies 

 of the echinoderm fauna is different, and there are 

 a number of additional and very striking forms. 

 Cldaris papillata, LESKE, is abundant at moderate 



PIG. 31. Allopora oculina, EHBENBERG. 



depths. On our second visit to the Holtenia groun< 

 we dredged one small specimen of the handsome 

 urchin already described, Porocidaris purpurata. 

 A fine brilliantlv-coloured urchin of the Echinus 



