24 



ECHINODERMS OF THE BRITISH ISLES 



in regular columns. Cirri without o])posing s])ine, but with a 

 long terminal claw. 



One species known from the British seas (and the Atlantic). 



1. P entametr ocrinus atlanticus (Perrier). (Fig. 11.) 



(Syn. Eudiocrinus atlanticus Perrier.) 



Cirri slender, xx-xxv, with 14-17 joints ; terminal claw 

 hook-iike. The first pinnule occurs on the 4th -5th brachial. 

 Arms smooth ; disk covered with small calcareous granules. 



Fig. 11. — Pentawetrocrinus atlanticus. (After Perrier, Explorations sous- 

 marines.) Nat. size. 

 The figure is incorrect. The cirri are too long, and they end in a hook, 

 not as here shown. (Cf. Monaco xxxiv. PI. XXXII. 17.) 



It is a very fragile species ; the specimens as a rule are badly 

 broken and incomplete when brought to the surface. 



Found off S.W. Ireland, ca. 1 100-1300 m. (" Helga "'). Known 



