ASTEROTDEA 89 



Cornwall, the west and east coast of Scotland, down to Northum- 

 berland ; also from Rockall Bank. Apparently it is rather rare. 

 Along the Scandinavian coasts it is distributed from the Kattegat 



Fig. 50. — Hippasteria phrygiana. Oral side. Slightly reduced. 

 (From Danmark'' s Fauna.) 



to Finmark. It is further known from Iceland and from Green- 

 land to 42° N. on the American coast. Also recorded from S. 

 Africa, but very probabh^ this South African form is not really 

 H. pJirygiana. Bathymetrical distribution ca. 20-800 m. 



II. Family Poraniid.^^ 



Marginal plates less distinct, partly overlapping. Dorsal side 

 convex, covered by a thick skin, naked or with short, conical, 

 isolated spines, or with a close covering of fine, microscopical 

 spines. No pedicellarise. Papulae scattered over the dorsal side. 

 Genital organs in the interradii, not passing into the ray. 



Three genera represented in British seas. A fourth, Tylaster 

 Dan. and Koren, with only known species T. Willei Dan. and 

 Koren, hitherto kno^\^l only from the deep sea between Iceland, 



^ This family is named Asteropidce in Koehler's ^chinodermes des 

 mers d* Europe and Faune de France, i. ; in Bell's Catalogue of British 

 Echinoderms it is named Gyninasteridie. 



