82 AXEL OHLIN, ARCTIC CllUSTACEA. 



always longer than in specimens living on more firni and 

 compact bottora. This interesting fact, viz., the modifying 

 influence of the bottom on the length of the pereiopods, the 

 same author al so states with regard to the other species of 

 the genus. Erythrox^s pygmcea, which dwells very often on 

 sandy bottom, has also relatively the shortest legs, whilst 

 Erythrops serrata and Erythrops microphihahna, living always 

 on muddy bottom, are provided with the longest ones. Now, 

 Särs points out this interesting fact to be observed even in 

 the same species. 



Of my specimens, three were males and two females. 



Length of larest male 18 mm. 

 » » » fe male 15,5 mm. 



36. Erythrops glacialis Gr. O. Sars. 



1877. Erythrops glacialis G. O. Sars, Prodr, descript. Crust. etc, 



1. c. p. 242. 



1885. » » G. O. Sars, Xorw. North. Atl. Exp. I, 



p. 45, pl. 5, fig. 1 — 4. 



Locality: 



in 1000: 



stat. 21. East Greenland, off Kaiser Franz .Toseph Fiord, betweeii 

 Boutekoe Island and Mackenzie Bay, depth 250 m., mud, 

 8 VIII, one spec. 



This species was obtained in two specimens during the 

 Norwegian North Atlantic Expedition in the open sea off 

 the coast of Norway at two stations. Both belong to the 

 cold area, and the depths were 498 and 350 fathoms resp. 

 As it has now been found also off East Greenland, Sars is, 

 no doubt, right in suggesting that it may unquestionably be 

 regarded as a true Arctic form. 



My specimen was a male with well developed pleopods 

 of the typical biramous appearance. In no detail, did it 

 deviate from the description and figures which Sars has 

 given of it in the work cited above. 



Le)iyth: 17 mm. 



