68 ME, E. J. MIEE3 ON THE IDOTEID^. 



This species is closely allied to the foregoing, but is distin- 

 guished by its more convex and proportionately narrower body, 

 and the form of the terminal segment, the distal end of which is 

 obtusely pointed, not emarginate and bicuspid. The head is 

 tubereulated above, the inequalities separated by deep depressions. 

 The thoracic segments are convex or tubereulated above in the 

 middle line, and very rugose on each side at some distance from 

 the lateral margins. The postabdomen is longer than broad at 

 base, and in the Museum specimen longer than the last four 

 segments of the thorax, convex above, and rather contracted 

 toward the distal extremity, with the lateral margins somewhat 

 sinuated ; the apex slightly produced and rounded and entire. 

 Antennae with the flagellum about 9-jointed. The terminal plates 

 of the opercular valves are longer and more narrowed at the distal 

 end (in the Museum example). Length rather more than f inch 

 (22 mm.), breadth nearly g inch (8 mm.). Colour (in spirit) grey, 

 with brownish markings. 



This species, like E. licuspida, has a wide circumpolar and 

 boreal distribution ; its range is from Siberia (Grulf of Tenissei) 

 westward, probably throughout the Arctic seas, and southward 

 on the east coast of .North America to St. George's Banks, and on 

 the west coast to British Columbia (Harger). 



In the British-Museum collection there is only one specimen 

 (a male) preserved in spirit, and believed to have come from 

 the west coast of North America. In the Paris collection I have 

 examined a considerable series of both sexes and different sizes 

 from the sea of Mourman, near the Tenissei (Swedish Exped. of 

 1875-76). 



In the Museum specimen and some of the Paris specimens the 

 projecting postero -lateral angles of the first, partially coalescent, 

 postabdominal segment form small lateral teeth. 



Kroyer, in his description of this species, says, " Epimera 

 annulorum tJioracicorum distincta, totum marginem annulorum 

 lateralem ohtegentia,^'' on which account only am I doubtful of 

 the specific identity of his species with S. nodulosa of Harger, 

 who, however, is probably right in attributing Kroyer's descrip- 



tion to an error ofpbservation^. J i 



^StU^ffifet HIETIPES 



Idotea hirtipes, M.-Edwards, Hist. Nat. Cr, iii. p. 134 (1840) ; Krauss, 

 Die sudafrikan. Crust, p. 61 (1843), 



