294 



Th. Mortensen. 



liydrographical conditions at this coast, the Gulf Stream making its 

 influence felt here along the whole coast even so far North as Spitz- 

 bergen and the White Sea. 



Among the littoral Echinoderms of Greenland there are several 

 species which occur along the whole coast; for the study of 

 the special relations of the fauna of Greenland these species are 

 partly of minor importance. They are the following: 



Heliometra glacialis 

 Hatbrometra prolixa 

 Pteraster militaris 

 Stichaster albulus 

 Ctenodiscus crispatus 

 Cribrella sanguinolenta 

 Solaster papposus 



Amphiura Sundevalli 

 Opbiacantba bidentata 

 Gorgonocephalus eucnemis 

 Ophioglypha robusta 

 Ophioçten sericeum 

 Myriotrochus Rinkii 

 Cucumaria frondosa 



Not known from North 

 East Greenland. 



Strongglocentrotus drøbachiensis 

 To these will probably be added: 



Asterias Miilleri, var. grønlandica 



Pteraster obscurus ^ 



Solaster fiircifer 



Ophioglgpha Sarsii 



Ophiopholis aculeata 



Gorgonocephalus Agassizii 



Eupyrgus scaber 



Ophioscolex glacialis, not known from North West Green- 

 land. 



Phyllophoriis pelliicidus, not known from the Angmagsalik 

 Region. 



Most of these species are widely distributed, even circumpolar. 

 Some of them occur far to the South, thus e. g. Cribrella sanguino- 

 lenta and Ophiacantha bidentata are known also from the Azores and 

 Ctenodiscus crispatus from the Gulf of Panama, and even so far 

 South as 53° S.^' along the South American West Coast. S la den 

 regarded the South American form as a separate species, Ctenodiscus 

 procurator, but Ludwig thinks it cannot be distinguished from the 

 northern species, 67. crispatus. The fact that Ct. crispatus thus occurs 

 along the whole Pacific coast of America is an argument in favour 

 of A. H. CI arks "Polar-Pacific" region, which is taken to embrace 

 "the Arctic and Antarctic seas and the entire Pacific coast of North 



' Not hitherto recorded from the West Coast but a specimen was taken there 



Ьз' the "Tjalfe"' Expedition. 

 - Ludwig. "Albatross'-Asteroidea. Mem. Mus. Comp. Zool. XXXII. 1905. p. 104. 



