11 



dactylus very slender. Carpal joint of the "2 anterior pairs of pereiopoda 

 oblong, with 34 slender setae on the posterior edge. Propodal joint of the 

 3 posterior pairs very slender, nearly as long as the 3 i.reeedino- joints cm 



1 i> , | 



bined; dactylus narrow and elongated. Last pair of uropoda with the basal 

 part about as long as the urosome, inner ramus slightly larger than 1 1n- 

 outer and about half the length of the basal part, Bod}- pellucid with dark- 

 purplish intestine and scattered pigmentary spots of same colour. Usual 

 length 10 mm. Maximum length of arctic specimens 17 mm. 



Remarks. - - Although the description and figures given bv Krover of 

 his Hyper ia oblivia are rather incomplete, I cannot doubt that they refer in 

 the present species, which moreover is stated by Dr. Hansen to occur off the 

 coast of Greenland, whence Kroyer procured his specimens. .From ]'. trifjoiia 

 of Dana it would seem to differ, among other characters, bv the much more 

 slender and narrow form of the propodal joint of the 3 posterior pairs of 

 pereiopoda. 



Occurrence. I have repeatedly taken this form in great number 

 on the west coast of Norway up to Finmark, and generally in great 

 depths, from 100 to 200 fathoms. A much smaller form, scarcely exceeding 

 5 mm in length but otherwise wholly agreeing with the typical species, I have 

 met with in less depth and occasionally even near the surface of the sea. 

 On the other hand specimens collected on the Norwegian North- Atlantic Ex- 

 pedition reach the considerable length of 17 mm. All the specimens were 

 taken either by the dredge or by a surface-net fixed to the dredge-rope. 



Distribution. British Islands (Sp. Bate), south coast of Green 



land (Kroyer, Hansen), several Stations of the Norwegian North-Atlantic Ex- 

 pedition from Lat. G3 to 71 (off Jan May en). 



Gen. 4. EuthemistO, Bovallius, 1887. 

 Syn: Tliemisto, Gu^rin, 1828. 



Body very slender and compressed, often distinctly carinated dorsally. 

 Cephalon irregularly rounded. Superior antennse in female shorter than the 

 inferior ones and having the nagellum more or less curved. <>ral parls 

 almost exactly as in Parathemisto. Gnathopoda likewise <!' a very similar 

 structure, but the carpal process of the 2nd pair generally larger, and the 

 dactylus shorter. The two anterior pairs of pereiopoda rather powerful, \\iih 

 the carpal joint greatly dilated, propodal joint slender and admitting ol liein-- 



