ASTEROID] \ <>l MiitTli PACIFK AND ADJACENT YVATEHS FISHER 



19 



southern margin well marked local Bui the specimens from Bering 



exhibit pretty much the entire •_' h 1 1 1 u t of structural variations. Both formae are 

 found iti the Arctic Ocean. Vmong the large number <>( specimens from >ttitii>n 

 3252, Bering Sea, nil the largest examples are referable to forms cribraria that 

 all having K over 30 mm., while about half "f the Bmall examples are forma </■ 

 landica or intermediate. In the list of specimens the forma found at ea< li Btation i> 

 marked e for cribraria, g for groenlandica, and > for intermediate or "indifferent" 

 forms. 



':IU'T TO r- 



To D nits umoi 



tiii n 



tuvii.MiF.n room >k>. 



IHO visimi.lt tiii. IVITHIMOI 



DORSAL mOM tlSIHII X 3 



Therejs s very characteristic feature of Bering Sea examples .•>- compared with 

 those trom^Greenland, Spitsbergen, and Kara Sea. The former generally have con- 

 spicuous clusters of pedicellariae on the outer adambulacral spines, and frequently 

 also smaller clusters on the furrow Bpines, although tlu'>t> maj occur sporadically 

 when the outer -^[ >i rn--; are well armed. Rather often t">ih seta are Bwell provided 

 with pedicellariae which do not <1 i tF«-r essentially from the abactinal crossed pedicel- 

 lariae, though sometimes n little larger. This characteristic seems collated with 

 imewhat greater abundance of pedicellariae elsewhere on t } » . - body. 



