37O VERRILL 



migrations have probably been going on during vast geologic periods 

 and, no doubt, are still in progress. 



Many of the existing genera of starfishes are doubtless of great 

 antiquity, geologically speaking, and show wonderful persistence in 

 many of the details of structure and habit. 



X. LISTS OF EXTRALIMITAL SPECIES PARTIALLY DESCRIBED, 



REVISED, OR FIGURED. 



Many other extralimital species, merely included in the faunal 

 lists, or only mentioned by name under their genera, are not included 

 in these lists. 



I. NORTH ATLANTIC AND ARCTIC SPECIES. 



Asterias vulgaris Ver. 



New England. 

 Asterias forbesi Desor. 



New England, etc. 

 A. acervata borealis = A. polaris. 



Arctic and North Atlantic. 

 Orthasterias tanneri Ver. 



Off East coast United States. PI. XLVIII, fig. 6. 

 O. subangulosa Ver. (nom. nov.) A. angulosa Per., preoccupied. 



West Indies. 



Stylasterias neglecta (Per. non Bell). 

 Coscinasterias tenuispina (Lam.) Ver. 



Europe; Bermuda. 

 Marthasterias glacialis (Mull.) Jul. 



Europe, etc. 

 Sclerasterias guernei Per. 



East Atlantic. 

 Leptasterias littoralis (Stimp.) Ver. 



New England. 

 L. compta (Stimp.) Ver. 



New England. 

 L. tenera (Stimp.) Ver. 



New England. 

 Ctenasterias spitzbergensis (D. and Kor.)- 



Arctic. 

 Urasterias linckii (M. and Tr.) Ver. 



Nova Scotia ; Arctic Ocean ; post-glacial fossil at Salem, Mass. PL LXX, 



figs. 1-4. 

 U. panopla (Stuxb.) Ver. 



Arctic. 

 Stichastrella rosea (Mull.) Ver. 



Europe. 

 Coronastcr briareus Ver. 



West Atlantic. 



