46 AXEL OHLIN, ARCTIC CRUSTACEA. 



This species iirst mentioned by Milne Edwards, was 

 afterwards deseribed by Kröyer in his classical raonograph 

 of the Northern species of Hippolytv. At the same place he 

 also describes another closely-allied form which lie named 

 Hippohitc (/ihha, the chief characteristic of wbicb was: Annu- 

 lus abdominalis tertius carina superficiei dorsalis triangulari 

 valde compressa armatus est.» 



GoÉs was the first who suspeeted that this is a character- 

 istic peculiar to the males, and Smith came to the same 

 conclusion that >Kröyer's (/ibha was based on old males of 

 H. Gaimardii. Hoek is the only one who thinks that the 

 peculiar form of the third segment of pleon is only an in- 

 di vidual variation, but all subsequent writers accord in be- 

 lieving H. Gaimardii and H. gihha to be females and males 

 resp. of the same species. 



Spence Bate established for this species the genus H(- 

 fairut! which, however, as already mentioned, Stebbing has 

 shown, is based on incorrect characteristics, and which he, 

 therefore, refers to Spiroiifocaris. 



As synonyraous with Hippoli/fe Gaimardii Smith has put 

 forwards H. pandaliformis Bell, and H. Belcheri Bell, and 

 in this he has been followed by most writers. 



The species has a very wide distribution. It occurs 

 along West Greenland as far north as lat. 78" 17' N., off 

 Grinnell Land, oif Baffin Land, Labrador, Nova Scotia and 

 East coast of United States as far south as Boston, »Arctic 

 Ocean and Bering Straits-^ (Stimpson), North-East coast of 

 Asia. There it has been recorded from Franz Joseph Land, 

 Nova Semla, Spitzbergen, Barents Sea, Murman Coast, Nor- 

 way, Kattegat, Western part of Baltic, at Kiel, Scotland, 

 Iceland, and, now, for the first time, from East Greenland. 



Its vertical range is from a few fathoms up to 200 

 fathoms or more. 



Length of greatest specimen (from East Greenland) 70 mm. 



Its sexual maturity is very variable. I have measured 

 females with roe the length of which varied from 40 mm. to 

 60 mm. The former ones were from stat. 39. 1898, where 

 the bottom temperature was above zero, while the larger ones 

 were dredged at stat. 5. 1898, where the temperature on the 

 bottom was 1,42 C. below zero. The individuals of that speci- 

 mens collected by Wulff at Tromsö were all still smaller. 



