134 ECHINODERMS OF THE BRITISH ISLES 



with small granules. Tube-feet in four regular rows, mostly to 

 the end of the arms. Both crossed and straight pedicellariae 

 present, scattered. Adambulacral plates all alike. Adambulacral 

 spines never carrying pedicellariae. 



Three genera represented in British (and European) seas. 



Key to the genera of Stichasteridce known from the British 

 (and European) seas. 



1. Lower marginals with a series of larger flattened spines, forming 



a conspicuous fringe along sides of arms 3. Gastraster Fevrier^ 

 No fringe of larger spines along sides of arms ... 2 



2. Disk plates forming a regular, conspicuous rosette ; dorsal skeleton 



of arms in very regular longitudinal and transverse series 



1. Neomorphaster Sladen 

 Disk plates not forming a distinct rosette ; dorsal skeleton of 

 arms not in very regular longitudinal and transverse series 



2. Stichastrella Verrill 



L Neomorphaster Sladen. 

 (Syn. Calycaster Perrier.) 



Disk plates forming a regular, conspicuous rosette of larger 

 (primary) plates. Dorsal skeleton of arms arranged in very 

 regular longitudinal and transverse rows (recalling Zoroaster). 

 Adambulacral plates with two spines. Tube-feet 4-serial, but 

 may become biserial towards the ends of the arms. 



This genus is transitional between the families Zoroasteridse 

 and Stichasteridse. Only one species known in British and 

 European seas. 



1. Neomorphaster talismani E. Perrier. (Fig. 76.) 



(Syn. N eomorpthaster eustichus Sladen ; Calycaster monoecus 

 E. Perrier.) 2 



Rays 5, tapering to a point, flattened on the under side. Along 

 the adambulacrals in the proximal part of arms a double series 

 of plates carrying a comb of (two) three divergent thick, somewhat 

 flattened spines, as long as the adambulacral ones, forming 



^ This genus is referred by Perrier and Fisher to the family Pedicel - 

 lasteridae, but in the opinion of the present author rather belongs to the 

 Stichasteridsp. 



^ The name Neo?norphaster Parfaiti Perrier used for this species in 

 Koehler's Echinodermes du " Caudan " is a misprint. 



