370) ECHIN0DERM8 OF THE BRITISH ISLES 



The two genera Kuphronides and Psychropotes are not very 

 sharply separated, a form like Kerhervei Her. being intermediate, 

 though api)arently rather an Euphronides than a Psychropotes. 

 The long tail probably is a swimming apparatus. 



Fig. 223. — Psychropotes Grimaldii ; ventral side (upper) and in side view 

 (lower figure). Much reduced. (After Herouard, " Monaco ", xxi.) 



Three species known from the N.E. Atlantic, viz. Psychropotes 

 buglossa Perr., from the Bay of Biscay and off the Canaries, 

 2110-5005 m. ("Talisman", " Princesse Alice"); Ps. fucata 

 Perr., 43° 15' N., 21° 40' W., 4165 m. (" Talisman ") ; and Ps. 

 Grimaldii Herouard, off the Azores, 4020 m. (" Princesse Alice "). 



Key to the N.E. Atlantic species of Psychropotes. 



1. Mid-ventral radius naked (" Monaco ", xxi., p. 25, PL III. 1-2) 



Ps. Grimaldii Her. 

 Mid-ventral radius with a double row of small tube-feet . 2 



2. Dorsal deposits of one kind only, cross -shaped bodies with short 



central spine and basal spine of arms short (" Talisman " 

 Holoth., p. 453, PI. XX. 29-30) . . Ps. fucata Perr. 



Dorsal deposits of two kinds — in the outer layer large, with strong 

 central outer projection and basal spine of arms nearly as large 

 as the central projection ; in inner layer simple crosses without 

 central projection (" Talisman " Holoth., p. 445, Pis. XIII. 

 3-4, XX. 16-28) . . . . . Ps. buglossa Perr. 



[Family Pelagothuriid.^] 



Body ovoid, without tube-feet, but with a circular disk round 

 the anterior end, supported by long rays. Tentacles bifurcating, 

 slightly branched. Calcareous bodies absent. 



The only genus known, Pelagothuria Ludwig, is represented 

 in the Atlantic by one species, Pelagoth. Bouvieri Herouard ; the 

 only known specimen was taken at the surface at 31° 38' N., 

 42° 38' W. (" Princesse Alice ") ; the species might well be 

 expected to occur also off the Irish west coasts. 



