BIHANG TILL K. SV. VET.-AKAD. HANDL. ISAND 26. AFD. IV. N:0 1'2. 21 



1.S87. Aiu'cus elongutns Hansen, Dijiiipluui-Togtots zool.-hot. Ud- 



bytto, p. 205, pl. 20, ligg. 4—4 a. 

 1«97. Gnatliia clongata G. O. Sars, Isopoda, p. öö, pl, 23, fig. 1. 



This well-kiiown arctie Ibrin, iiext Gnathia maxillaris 

 (Montagu) oiie of the first described species of tliis anomal- 

 ous genus, was found by me in l^^OS at two stations, viz. 



stat. .32. Kiiig Charles Island, »Bremer-Sound», depth 100 — 110 m.» 

 bottom tern]). — 1,46' C, sött clay with great stones, Bi- 

 loculina scarce, 8 VIII, two tuUgrown, ovigerous females, 

 foTU' larvas on different stages. 

 ?j\. lat. 78' 50' N., long. 29' 39' E., King Charles Island, de])th 

 (JO— 70 1)1.. sött, Itlaok-grayisli clay, 17 VIII, one inalo. 



The ma le and females agree exactly with Kröyer's and 

 Särs' descriptions. and as the P>vr)i/.:Y/-lai'vas were captnred 

 in the same trawling as the females, 1 must reg-ard them as 

 belonging to this speeies. In fig. 2 I give a figure of the 

 youngest larva. 



Length of niale 4 mm. 



Breadth > 1,3 » 



Length » female 4 » 



Breadth > 2 » 



Length ' the oldest larva 4,3 ' 



Breadth 1,9 » 



The colour of the male is grajäsh-white, that of the fe- 

 male waxlike yellow. and that of the larvas yellowish-white 

 or nearly white. The eyes are in all red-brownish. 



Kröyer described this species from a specimen which he 

 found occasionally in a glass with amphipods from Green- 

 land; has it perhaps lived as parasite on one of these?v. he 

 asks. As 3'et this is according to Hansen the only and a 

 little doubtful record of its occurrence at the coasts of Green- 

 land. Elsewhere it has been found rather abundantly by 

 G. O. Särs at the Northern coast of Norway as far south as 

 Lofoten and, during the Norwegian North Atlantic Expedi- 

 tion, at two stations, sitnated the one ofF Jan Mayen, the 

 other between North Cape and Beeren Island. The Dijmphna 

 Expedition got a few specimens from the Kära Sea. 



Its vertical distribution ranges frcnn hO to 350 m. and it 

 has been observed both in the cold and the warm area. 



