124 



ECHINODERMS OF THK BRITISH ISLES 



in the outer part of the genital region, beyond which the series 

 are rudiinentary, only two spines on each side. The basal part 

 of the arms with only a few irregularly scattered, small spines. 

 The species of this genus appear to prefer a rocky bottom. 



1. Odinia pandina Slsiden.^ (Fig. 72.) 

 Plates of disk each with 2-3 spinelets, ca. 2 mm. long ; spines 



Fig 



72. — Odinia pandina ; somewhat reduced. 

 Depths of the Sea.) 



(After Wyv. Thomson, 



of arms forming 5-6 arcs across the genital region, beyond which 



1 In case it is ultimately proved definitely that O. robusta and setni- 

 coronata are identical with 0. pandina, the name to be used is semi-coronata, 

 which is the older and the type species of the genus Odinia. 



