A Revised List of British Ecliiiioidea. 431 



Diagnosis. 



Comparatively short and stout ; the post-anal process short ; 

 superior surface evenly arched, sloping gradually downwards 

 from the centre to the anal notch ; seen from above the test 

 narrows anteriorly, and the oral notch is comparatively small. 



I have not seen a specimen. 



Distribution. 



British Seas. — Fffiroe Channel, cold area, "Porcupine" (18G9), 

 St. 64, 640 fms. (Thomson, 1, 2). "Knight Errant," St. 8, 

 540 fms. (Agassiz, 4). 



Other Localities. — Bay of Biscay (Norman, 5). U. S. Coast, 

 843-1555 fms. (Verrill). 



29. Pourtalesia phyale, Wyville Thomson. 



1874. Pourtalesia iiiliyalc, AVyv. Tliorasoii, "Porcupine" Ecliin., 



Phil. Trans., p. 749, pi. Ixx. fig. 11. 



1881. ,, ijhialc, Agassiz, Rep. "Challenger" Echini, j). 



138, pis. xxii., xxiia. 



Diagnosis. 



Comparatively large and comj^ressed laterally ; post-anal process 

 long; superior surface very slightly ^arched, and descending 

 suddenly to the anal notch ; seen from above the test at first 

 narrows towards the anterior end, but expands at the extremity 

 by reason of the everted lips of the large triangular oral 

 depression. 



Distribution. 



British Seas.— S.-W. of Rockall, " Porcupine '' (1869), St. 28, 

 1215 fms. (Thomson, 1, 2). 



Other Localities. — Southern Ocean, "Challenger," St. 156. 1975 

 fms. (Agassiz, 3). Kerguelen, Australia (Agassiz, 5). 



BIBLIOGRAPHY. 



Agasstz, a. (1), Preliminary Report on the Echini and Starfishes dredged in 

 Deep Water between Cuba and the Florida Reef, by L. F. de Ponrtales, 

 Assistant U.S. Coast Survey. Bull. Mus. Comp. ZooL, i. ,pp. 253-308, 

 1869. 



(2), Revision of the Echini — Illust. Cat. Mus. Comp. Zool., jS'o. 



vii., 1872-74, pp. 762, 94 plates. 



