22 4 CRUSTACEA MALACOSTRACA. Ill 



a. Head just behind the insertion of the antennulse about as broad as near the middle of its 

 lateral margins. Last abdominal segment about as long as broad at the base. 5. G. albescens n. sp. 

 ji. Head just behind the insertion of the antennulae much narrower than at the middle of its 

 lateral margins. Last abdominal segment much longer than broad at the base. 



6. G. bicolor 11. sp. 



b. Tergite of the penultimate leg-bearing segment divided in the median line. Sides of the thoracic 



segments with teeth and processes. Large species 7. G. stygia G. O. S. 



158. Gnathia elongata Kroyer. 



?i846. Auceus elongatus Kroyer, in Gaimard, Voy. en Scand., Crust. PI. 30, figs. 3 a— 3 g. 



^47. — — Kroyer, Naturh. Tidsskr. Ny Raekke, Vol. II, p. 388. 



! 1897. Gnathia elongata G. O. Sars, Account, II, p. 55; PI. 23, fig. 1. 



The male is easily distinguished by the dorsal depressions, and it has been well figured by 

 Sars. Among the considerable material from Ameralik Fjord, West Greenland, I found a single male 

 which looks rather different, as the head is distinctly longer and more quadrangular than in other 

 specimens, the dorsal depressions on the penultimate leg-bearing segment less developed and on the 

 last segment nearly wanting, while the last abdominal segment is conspicuously shorter than the 

 uropods, and its major distal part shorter than usual; I suppose, however, that this specimen has been 

 anomalously developed, so that the differences mentioned cannot be taken as due to normal variation, 

 and for various reasons I cannot think that the specimen may belong to another, hitherto un- 

 known species. 



The female, which has been well figured by Sars, can be separated from those of the following 

 eye-bearing forms by the more slender body — frequently more slender than that figured by Sars — by 

 the strong setse on the produced lateral angles of the five anterior abdominal segments, together with 

 the setse on the front part of the head. 



Occurrence. The "Ingolf" has captured G.elongata at seven places. 



Davis Strait: Stat. 32: Lat. 66°35' N., Long. 56°38' W., 318 fath., temp. 3-9°; 3 spec, (c?) 



West Greenland: Mouth of Ameralik Fjord, Lat. 64°c>3' N., 5—70 fath., 14 spec. (7 normal o*, 



1 anomalous c?). 



East Iceland: Seydis Fjord, in a fishing net; 1 spec. ($). 



East of Iceland: Stat. 59: Lat. 65°oo' N., Long. n°i6' W., 310 fath., temp. -^ o-i°; 1 spec. (?). 



North of Iceland: Stat. 126: Lat. 67°i9' N., Long. i5°52' W., 293 fath., tgmp. -f- 0-5°; 4 spec. (1 cT, 



3 larvae). 



South of Jan Mayen: Stat. 116: Lat. 70°05' N., Long. 8°26' W., 371 fath., temp. -4-04 ; n spec. 



(4 c?). 



Jan Mayen: Stat. 115: Lat. 70°5o' N., Long. 8°29' W., 86 fath., temp. o-i°; 6 spec. (4 d\ 2?). 



Furthermore it has been secured at a number of places in our area by several zoologists. 

 Vanhoffen has recorded it from Lille Karajok Fjord, West Greenland, Lat. 70°3o' N. At East Green- 

 land it has been taken by the Ryder Exp. at Tasiusak, Lat. 65°37' N., and at Lat. 6g°25' N., Long. 



