11 



(lactylus very slender. Carpal joint of the 2 anterior pairs of pereiopoda 

 oblong, with 3 — 4 slender setre on tlie itostorior edge. Projjodal joint of tlie 

 3 pcsterior pairs very slender, nearly as long as the 3 preeeding joints (•(un- 

 bined; dactyliis iiarrow and elongated. Last pair of ni-opoda witli tlio lias;il 

 part aboiit as long as the nrosome, inner ramus slightly larger than the 

 onter and abont half the length of the basal part. Body pellucid with dark 

 purplish intestine and scattered pigmentary .spots of same colour. Usual 

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



McDinrlxS. — Although the description and figures given b}- Kro\-er of 

 his Hyprrid. ohlirin are rather incomplete, I cannot doubt that they refer to 

 the present species, wluch moreover is stated by Dr. Hansen to occur oflp the 

 coast of (rreenland, whence Kroyer procured his specimens. From 1'. frifjoiifi 

 of Dana it wnuld seem U< ditfer, among other characters, by the mncli more 

 slender and narrow Ibrm of the propodal joint of the 3 jjosterior ])airs of 

 pereiopoda. 



Occurrence. — I have repeatedly taken this form in great number 

 on the west coast of Norwa}- 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 occasicmally 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 liy a surface-net fixed to the dredge-rope. 



Disfrihiifion. — British Islands (8p. Bate), south coast of (Green- 

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

 pedition from Lat. 63" to 71» (off Jan Mayen). 



Gen. 4. EuthemistO, Bovallius, 18S7. 

 Syn: Tliriiiisto. Un^rin, 1828. 



Body very slender and compressed, often distinctly carinated dorsally. 

 Cephalon irregularly rounded. Su[ierior antennae in female shorter than the 

 inferior ones and having the fiagellum more or less curved. Oral pai'ts 

 almost exactly as in Parathemisto. Gnathopoda likewise of a very similar 

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

 dactylus shorter. The two anterior paii's of pereiopoda rather powerful, with 

 the carpal joint greatly dilated, propodal joint slender and admitting of being 



