210 



ECHINODERMS OF THE BRITISH ISLES 



Spines 7-10, partly compressed ; primary plates not distinct 



A. mediterranea Lym. 

 G. Spines 3-4, not curved or hooked^ 



2. A. bellis, var. tritonis Hoyle 

 Spines 5 ; the second with a terminal hook ; radial shields 

 small ; ventral plates beyond disk keeled ^ 



A. grandis Koehler 



Spines 7 (6-8), the second slightly incurved ; ventral plates not 



keeled^ . . . . . .A. Otteri Ljungm. 



Fig. 119. — Amphiura Griegi; part of oral (a) and dorsal side (6) ; two arm- 

 joints in dorsal (c) and side view (d). x 14. (From Th. Mortensen, 

 Scand. Ech.) 



7. Underside of disk \v holly naked ; outer mouth papilla conical, 



slender; 6 arm spines (Fig. 119) . . A. Griegi Mrtsn. 



Underside of disk with scales near the outer edge ; outer mouth 

 papilla conical, thick ; (4) 3 arm spines 



A. Eickardi Koehler 



8. Lower arm spine curved, sabre shaped, much longer than the 



other four, equalling 2 arm -joints ; radial shields small, less 



forms a rounded edge ". A detailed description and figures of this species 

 are given in Koehler's " Contribution to the study of Ophiurans of the 

 U.S. National Museum ", Bull. U.S. Nat. Mus. 84, 1914, p. 55, PI. 18, 1 and 3. 

 1 The species A. bellis, var. tritonis, A. grandis and A. Otteri appear to 

 be very nearly related and not easily distinguished. For a detailed 

 description and figures see Hoyle, " Rep. on the Ophiuroidea of tlie Faroe 

 Channel, mainly coll. by H.M.S. ' Triton ' ", Proc. R. Soc. Edinh., 1884, 

 p. 716, PI. VII. 1-3; Koehler, Monaco, xxxiv. p. 175, PI. XXVII. 3-7; 

 Koehler, Bull. U.S. Nat. Mus. 84, p. Gl, PI. 8, 5-9. 



