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. 



Cldarls papillata, Leske, is abundant at moderate 



Fro. 81. — Allopora oculina, Kithex-beth:. 



depths. On our second visit to the Ho! tenia ground 

 we dredged one small specimen of the handsome 

 urchin already described, Porocidaris purpurata. 



A iine brilliantlv-coloured urchin of the Echinus 



