Report on the Kchinoderms of North-East Greenland. 295 



and South America". ' Even if Ci. procurator could be maintained 

 as a distinct form, it would, through its near relation to Ct. crispatus, 

 be of the same importance as argument for this remarkable uniting 

 of the Arctic and the Antarctic into one region. A corresponding 

 fact is perhaps found in the distribution of the species Psolus 

 squamatiis and Ps. segregatus, and perhaps even other Holothurians, 

 while in the Echinoids no such instance appears to exist. 



It is possible to distinguish an arctic and a boreal element 

 among these species occurring round the whole coast of Greenland. 

 Thus Heliometra glacialis, Stichaster albulus, Pteraster obscurus, Stron- 

 gylocentroiiis drøbachiensis , Amphiiira Siindevalli, Gorgonocephalus 

 eucnemis, Myriotrochus Rinkii and Eupyrgiis scaber are decidedly 

 arctic forms, Solaster papposus, Cribrella sanguinolenta, Ophioglypha 

 Sarsii, Ophiacantha bidentata and Phyllophorus pellucidus boreal forms, 

 while it may be difficult enough to state of the rest of them, whether 

 they ought to be regarded as arctic or boreal. 



The remainder of the littoral Echinoderms are of more restricted 

 distribution along the Greenland coasts. The following species are 

 known fro m the West Coast alone: 



Asterias polaris Chirodota Icevis 



— Miilleri Cucumaria calcigera 



Solaster endeca Psolus Fabricii 



Ophioglypha nodosa — phantapus 

 — Stuwitzii 



From the East Coast alone are known: 



Pteraster puluillus Solaster glacialis 



Poraniomorpha tumida — squamatus. 



From the Northwest and East Coast alone are known: 



Asterias Linckii 

 — panopla 

 Pedicellaster palceocrystallus. 



It will be necessary to recall the distribution of each of these 

 species separately. 



Asterias polaris is known to occur only along the East Coast of 

 North America, from Lat. 45° N. to Lat. 70° N., and at the West Coast 

 of Greenland to at least 65° N. — According to Östergren^ it is 

 nearly related to A. camtschatica from the Bering Sea "und hat sich 

 zweifelsohne von dort ostwärts nach Grönland verbreitet". 



' A. H. Clark: The recent Crinoids and tlieir relation to sea and land. The 



Geographical Journal. 19U8. p. 603. 

 2 Zool. Anz. XXVII. Nr. 1У. 1904. p. 615. 



