16 AXEL OHLIN. ARCTIC CRUSTACEA. 



ISSfj. Lei)t()giiatliia loiigiirmis G. O. Särs, Norw. Xnrth Atl. Kx]). 



1. c. i>. 79, ]>1. 7, tig. 17 — 2S. 

 1SS7. » » Hansen, Mahu-. mar. Groeiil. oci-id. 



1. c. i>. 179, tal), (j, lig. 9—9 1». 

 1896. » ; G. O. Sars, Isopoda, 1. c, p. 27, pl. 12. 



Localities: 

 in 1898: 

 stat. 10. lat. 77' 9' N., long. 14" 40' E., oft" Ice Islands, deptli 90 m., 

 sött, grav clay, 27 M, one spec. 



in 1899: 

 stat. 20. lat. 74° 35' N., long. 18 23' W., S. (.f Littlo Pcndnlnm Is- 

 land, dcpth 18 — 21 m., saudy niud, algas, O VII, oiic sjtoc. 



My specimens whicli are both females, tlie one with ovi- 

 gerous lamellse, agree pretty well with Särs' descriptions and 

 figures of his Lcptoiitiathia longireniis (— Tanais islandicus). 

 From LiLLJEBOR(}'s Tanais longircmis they difFer in having 

 the dactylus of the clielipeds serrated along the outer mar- 

 gin and the same of second pair of pereiopods not verv short, 

 about of the same length as the penultimate joint. In these 

 points they more resemble Tanais {/racilioiths Lilljeborg, al- 

 though diiferiug from that nearly allied species in other re- 

 spects. Thus, if I identify Tanais lomjiremis Lilljeborg with 

 Särs' LcptognatJtia longiremis, I do that, a.s Hansen, with a 

 great hesitation and only on the anthority of Särs. 



Lilljeborg found this species in the collections of the 

 »Riksmuseum» in Stockholm from Bohuslän and, according to 

 Särs, it occurs along the whole Norwegian coast, and it was 

 obtained on the Norwegian Xorth x\tlantic Expedition off 

 Reykjavik, Iceland, and at station :^90 between Finmark and 

 Beeren Island, all these places belonging to the warm area. 

 In his valuable catalogue of Malacostraca from West (Ireen- 

 land, Haxsen enumerates a young female from Kekertak which 

 agrees perfectlj^ with Lilljeborg's Tanais lon(/irrmis, hut as 

 to the Identification of which with the same species of Saks 

 he has, with all reasons, great doubts. 



It ranges liathymetrically from a few (7 — >>) to nearly 

 200 fathoms. 



Length 4 mm., breadth 0,5 mm.^ 



^ Since the above was written, Dr. Haxsen, of Copenhagen. has kindly 

 communicated to me that he has also found this form among the rich collections 

 of the Ingolf Expedition. After a careful examination and comparison with 



