330 



ECHINODERMS OF PHE BRITISH ISLES 



Appears to belong more to the mud bottom than does 

 S. purpureus. Development unknown. 



In British seas this species is stated to be by far the most 



Fig. 192. — Labrum of Spatangus Raschi (1) and Sp. purpureus (2). 



abundant echinoderm off the west coast of Ireland in depths of 

 ca. 150-1000 m. Also found off the Shetland Islands and at the 

 Lousy Bank, but not known from the North Sea coasts, the Irish 



^^^'i^i:>?^:)mm\: 



# 





^^it. 







.#^^l^„.._.....^^^ 





•■■im 



1 



^ 



.m 



Fig. 193. — Subanal fasciole of Spatangus Raschi (upper figure) and 

 *S'^. purpureus (lower figure). Slightly enlarged. 



Sea, or the south coasts. It is elsewhere distributed from 

 Tromso on the coast of Norway to the Bay of Biscay and the 

 Azores, but not found in the Mediterranean nor on the east 

 coast of N. America. Bathymetrical distribution ca. 150-1000 m. 



2. Echinocardium Gray. 



(Syn. Amphidetus L. Agassiz.) 



Besides the subanal fasciole an inner fasciole is present, 

 surrounding only the frontal ambulacrum and the apical system. 

 Often a trace of a fasciole is seen issuing from the subanal 



