Report on the Echinoclerms of North-East Greenland. 297 



that it will prove to have a wider distribution in the Polar Seas. 

 It must be supposed to have originated in this region. 



Asterias panopla is known from the northern part of the West 

 Coast and from the East Coast. It is further known from Spitz- 

 bergen and the Siberian Ice Sea, but not from the American East 

 Coast. A. Linckii has a quite similar distribution, but it is also 

 known from the American Coast (Nova Scotia). Both are purely 

 arctic species. The wandering to North America of A. Linckii may 

 be supposed to have taken place in the same way as with Pteraster 

 pul villus. 



Ophioglypha nodosa is a circumpolar species, but it is not known 

 from the northern West Coast or the East Coast of Greenland. 



Oph. Stuwitzii is known only from the West Coast of Green- 

 land and from the Arctic East Coast of North America, as is also 

 the case with Asterias polaris. 



Chirodota lœuis^ is circumpolar; it occurs on the East Coast of 

 North America from 42° N. and along the whole West Coast of 

 Greenland, but not on the East Coast. 



Cucumaria calcigera occurs from the Bering Sea to the Kara Sea, 

 but is not known from the Siberian Ice Sea ; it is thus not circum- 

 polar. Its distribution at North America and Greenland is as that 

 of Chirodota lœvis. 



Psolus phantapus is a boreal type, but evidently an eurytherm 

 form. It occurs along the Arctic East Coast of North America and 

 at the West Coast of Greenland to 70° N. On the European Coasts 

 it occurs from England and Denmark to Spitzbergen and the White 

 Sea. Its distribution seems to agree with that of Solaster endeca. At 

 the East Coast of Greenland it is not found. On the other hand it 

 is recorded from Jan Mayen (Fischer. Op. cit. p. 38); this does 

 not seem in accordance with its distribution as otherwise known, 

 and from zoogeographical reasons I might venture to suggest that 

 it is a mistake for Ps. Fabricii. This latter species is an arctic, 

 circumpolar species. It is known from the Arctic East Coast of 

 North America, from the West Coast of Greenland, but not from 

 the East Coast. 



After this revision it appears that the littoral E chin od er m - 



fauna of Greenland consists of at least three, perhaps 



four, different elements, viz. 1) endemic species, 2) At- 



1 In the Report of the Danish Biological Station. IX. 1899. p. 9, 10, 56. Chirodota 

 lœvis is recorded from the Skagerak. I take the occasion here to correct this 

 statement, which rests on a wrong determination. I have examined some spe- 

 cimens from there and find them to be Myriotrochus vitreus (M. Sars). Chiro- 

 dota lœvis is not кполуп from farther Sonth than 67° 50' Lat. X. (Grötö) at the 

 European coast. 



