368 ECHINODERMS OF THE BRITISH ISLES 



Ellipinion Herouard. (Fig. 218, 4-5.) 



Body ovoid, narrowing anteriorly. Mouth subterminal ; 10 

 tentacles. Lateral tube-feet all along the body. Dorsal papillae 

 only in anterior end, often asymmetrical. Calcareous deposits 

 simple, pointed rods and C-shaped spicules. 



Only one species, E. Delagei (Herouard) (Syn. Scotoplanes 

 Delagei Her.), known from the N.E. Atlantic, namely from off the 

 Azores and Cape Verde, 1165-2478 m. (" Princesse Alice "). 



Periamma R. Perrier. 



Body oval or elongate. 10 tentacles. Dorsal papillae in 

 anterior part of body forming a transverse series of 3-4 separate 

 or coalesced papillae, and behind these a number of very small, 

 isolated papillae. Lateral tube -feet usually only in the posterior 

 half of the body. Calcareous deposits 3-radiate and C-shaped 

 spicules ; wheels may be present. 



Two species are Known from the N.E. Atlantic, viz. P.furcata 

 (Her.) (Syn. Kolga furcata Herouard), from off the Azores and 

 the Bay of Biscay, 1846-2320 m. (" Princesse Alice "), and 

 P. rosea R. Perrier, from between the Azores and Spain, 4060- 

 5005 m. (" Talisman "). They are thus distinguished : 

 The two anterior pairs of dorsal papillae of equal length, scarcely 

 reaching the anterior end of the body. They are united by a 

 web nearly to their end. Three -radiate deposits with arms 

 ca. 0-3 mm. long, each carrying a bifurcating outer process 

 (" Monaco ", xxi., p. 40) . . . P. furcata (Her.) 



The first pair of dorsal papillae much longer than the second, dis- 

 tinctly surpassing the anterior end of body ; the uniting web 

 scarcely reaching beyond half their length. Three -radiate 

 deposits with arms ca. 0-09-0-17 mm., each carrying an un- 

 divided, spinous outer process (" Talisman " Holoth., p. 419) 



P. rosea Perr. 

 Scotoanassa Theel. (Fig. 218, 2-3.) 



Body more or less flattened ; mouth ventral ; 10 tentacles. 

 Lateral tube-feet confined to the posterior edge of the body, 

 united so as to form a fringe. Dorsal papillae forming an anterior 

 fringe, not raised above the dorsal surface. Calcareous deposits 

 4-armed bodies with 4 outward directed processes. 



Only one species known from the N.E. Atlantic, Scotoanassa 

 translucida Herouard (Fig. 218, 4-5), found off the Azores and in 

 the Bay of Biscay, ca. 4200-ca. 5000 m. ("Princesse AUce "). 

 It appears that the younger stages are bathypelagic, actively 

 swimming. 



