ME. E. J. MIERS ON THE IDOTETDiE. 67 



about as long as broad at base, nearly smooth, moderately convex 

 with the lateral margins converging regularly to the distal extre- 

 mity, which has a small shallow rounded notch, and with a sino-le 

 lateral suture on each side at base, indicative of a coalesceut seo^- 

 ment. Eyes large, prominent. Antennules in the adult scarcely 

 reaching beyond the base o£ the penultimate peduncular joiut of 

 the antennae, somewhat remote from one another, with their basal 

 joints very small. Antennae about half as long as the body ; the 

 last peduncular joint longer than the preceding ; flagellum 14- 

 l7-jointecI. Legs moderately robust, rather thinly pubescent ; 

 claws slender. Terminal plates of the operculum triangulate, and 

 but little longer than broad at base. Length of the largest male 

 about 1 inch (25 mm.), breadth nearly g inch (12 mm.j. 



E. licusjpida is a widely distributed inhabitant of the boreal 

 and Arctic regions ; its ascertained range is from Spitzbergeu to 

 Behring's Straits, and southward along the eastern coast of North 

 America to the Gulf of St. Lawrence. 



There is in the Museum collection a dried example without 

 locality (Sir J, E.ichardson) ; six specimens in spirits, males and 

 young, from the Matyushin Shar (Capt. A. H. Markham) ; and 

 two adult females and two young in spirit without locality 

 (Haslar Hospital). 



Capt. Markham's specimens stiH present traces of the beautiful 

 coloration mentioned by Mr. Lockington, having purplish cloud- 

 ings on a lighter ground. 



The identification of Idotea pulclira with E. iicuspida is made 

 by Mr. Lockington himself in a MS. marginal note of the copy 

 of his paper communicated to the author. 



I can see no sufficient reason for separating either the Idotea 

 rugulosa, Buchholz, or the Synidotea incisa of Sars, both from 

 Spitzbergen, from this species. 



Idotea nodulosa, Kroyer, N^turhist. Tidsskr. (2 R.) ii. p. 100 (1846) ; 

 id. 1 Atlas of Crust, in Voy. en Scand. pi. xxvi. fig. 2; Reinkardt, 

 Fortegnelse over Gronlands Krehsdyr, p. 34 (1857) ; Liitken, List of 

 Crust, of Greenland in Arctic Manual, p. 150 (1875). 



Synidotea nodulosa, Haryer, Am. Journ. of Sci, S^ Arts, (ser. 3) xv. 

 p. 3/4 (1878); id. Pr. U.S. Nut. Mus. ii. p. 160 (1879); id. Rep. 

 Geol. Survey Canada, p. 218 B (1878-79) ; id. Isopoda in Rep. U.S. 

 Fish Commission, part vi. p. 351, pi. vi. figs. 33-35 (1880). 



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— E4K>TiA ISrODTJLOSA. -^^/ 



