290 



Th. Mortensen. 



36. Ophioglypha nodosa (Ltk.). 



37. — Stiiwitzii (Ltk.). 



38. Ophiocten sericeum (Forb.) 



39. **Ophiomusium Lymani Wyv. 



Thoms. 



40. Ophiopholis aculeata (O. F. 



Müll.). 



41. **Ophiactis abyssicola M. Sars. 



42. Ophiopus arcticus Ljungm. 



43. Amphiura Sundeualli (M. Tr.) 



44. Ophiacantha bidentata (Retz.). 



45. — anomala G. O. 



Sars. 

 46.** — abyssicola G. O. 



Sars. 



47. Ophioscolex glacialis (M. Tr.). 



48. — purpureas Düb. 



Kor. 



49. Gorgonocephalus eucnemis 



(M. Tr.). 



50. — Agassizii 



(Stimps.). 



51. 



52. 



Echinoidea. 

 Phormosoma placenta var. 



Sigsbei (Agass.). 

 Tromikosoma Koehleri Mrtsn. 



53. Strongylocentrotus drøbachi- 



ensis (O. F. Müll). 



54. Pourtalesia Jeffreysi Wyv. 



Thoms. 



55. — Wandelt Mrtsn. 



56. Aëropsis rosirala (Wyv. 



Thoms.). 



57. Brisaster fragilis (Düb. Kor.). 



Holothurioidea. 



58. Myrioirochus Rinkii Stp. 



59. * — Théeli Östergr. 



60. Chirodota lœuis (Fabr.). 



61. *Trochoderma elegans Théel. 



62. *Kolga hyalina Dan. Kor. 

 63.**Lœtmogone violacea Théel. 



64. Molpadia arcf/ca (Marenzeller). 



65. — Blakei, var. grönlan- 



dica Mrtsn. 



66. Eupyrgus scaber Ltk. 



67. Cucumaria frondosa (Gunn.) 



68. — са/с/д-ега (Stimps.). 



69. Psolus Fabricii (Düb. Kor.). 



70. — phantapus (Strussenf.). 



71. Phyllophorus pellucidus (Fle- 



ming.). 



It maj' be conclnded with certainty that still a considerable 

 number of Atlantic Deep-Sea Echinoderms will be found in the 

 deep parts of the Davis Strait and the Danmark Strait and thus 

 belong, in some way. to the Greenland fauna. Likewise there can 

 scarcely be any doubt that all the deep-sea Echinoderms of the 

 Northern Sea will prove to occur off East Greenland, so that e. g. 

 also Elpidia glacialis Théel will belong to the Greenland fauna. This, 

 however, will not alter the main character of the fauna as it appears 

 from what is known already. With the littoral Echinoderms the 

 matter is different, it being ver}^ doubtful wdiether other species than 

 those already recorded will ultimately be found at Greenland. 



On dealing with the zoogeographical interrelations of the above 

 named species we may first distinguish between the littoral and the 

 abyssal species. In the "Ingolf" Echinoidea II (p. 178) I have, in 

 agreement with A. Agassiz, defined the littoral region as going 

 from — 100 fathoms; the region from 100 to 500 fathoms is desig- 



