88 



that species — or whether, indeed, 0. quadrispinus be not 

 identical with 0. purpureus. 



O.purpureus is known only from the coasts of North Europe 

 and from the Westindies; from the East coast of North-America 

 0. quadrispinus is recorded instead of this species. The geogra- 

 phical distribution thus seems to indicate that the two species 

 are synonymous ; that 0. purpureus should occur at the Westindies 

 but not at the Eastcoast of N. -America, is very improbable. But 

 a close examination of authentic specimens of 0. quadrispinus 

 is needed, before this question can be settled. 



28. Gorgonocephahis eucnemis (M. Tr.). 



Lütken: Additamenta. p. 70. — Sars: Norges Echinodermer. p. 4. — 

 Do/lerlein: Op. cit. p. 226. — Bell: Op. cit. p. 138. — Grieg: Oph. d. 

 Arktis, p. 268. 



Turner Sund, 120 fathoms, 8 specimens, large and small. 

 — Кар Brewster, 250 fath., 1 sp. — Кар Tobin, 57 fath., 2 sp. — 

 Кар Hope, 121 fath., 1 sp. 



29. Gorgonocephaliis Agassizii (S limp son). 



Duncan & Sladen: Op. cit. p. 69. — Fischer: Echinodermen von Jan 

 Mayen, p. 37. — Döderlein: Op. cit. p. 227. — Grieg: Oph. d. Arktis, p. 271. 



Jan Mayen, 50 fath., 1 specimen (12 mm. diameter of disc). 



Echinoidea. 



30. Strongylocentrotiis drebachiensis (0. F. Müll.). 



Lütken: Oversigt over Grønlands Echinodermata. p. 24. — Duncan 

 & Sladen: Op. cit. p. 19. — Agassiz: Revision of Echini, p. 277. — Bell: 

 Op. cit. p. 156. 



Кар Tobin, 57 fathoms, 41 specimens. — Кар Hope, 120 

 fath., 3 sp. — Кар Dalton, 9—10 fath., 1 sp. — Forsblad Fjord, 

 90 — 50 fath., 3 sp. — Rathbom Island, 94 fath., 6 sp. — Henry 

 Land, 20 fath., 32 sp. — Jan Mayen, 15 fath., 3 sp. Jan Mayen, 

 50 — 60 fath., 1 specimen. 



