34S 



ECHINODERMS OF THE BRITISH ISLES 



more excavate than in Pourtalesia. Colour of preserved speci- 

 mens white. Largest size recorded, 18 mm., but as the genital 



1 2 3 



Fig. 208. — Echinosigra phiale. x 2-3. ( After Th. Mortensen, Echinoidea 

 Deutsche Sudpolar Exped.) 

 1. From above. 2. From below. 3. Side view. 



openings have not yet appeared in specimens of that size, it 

 must reach a larger size than this. 



Fig. 209. — Tridentate pedicellaria (1), valves of ophicephalous (2), and of 

 rostrate pedicellaria (3) of Echinosigra phiale; valve of rostrate \)ed\- 

 ceUAv'ia oi Echinosigra paradoxa (4). 1, x 85 ; 2-3, x 145 ; 4, x 105. 

 (After Th. Mortensen, Echin. Deutsche Siidpolar Exped. (1-3), and 

 ''Ingolf Ech., ii. (4).) 



Biology and development unknown. 



This species is known with certainty only from off S.W. 

 Iceland (" Ingolf ") and the Antarctic Sea (" Gauss "). It is 



