Pacific Coast of North America. 263 



36. Glyptonoius Sahini (Kioyer). 



Idofea Sahini, Krcjyer, Nat. Tidsskrift, 2nd ser. ii. 1847, p. 401 ; Atlas 

 of Crust, in Gaimard's Voy. en Scand. pi. xxvii. fig. 1 ; Reinhardt, 

 Fortegnelse over Gronland's Krebsdyr, 1857, p. 34; Liitken, List of 

 Crust, of Greenland in Arctic Manual, 1875, p. 149; Sars, Arch. f. 

 Math, og Naturvidensk. ii. 1877, p. 350. 



Chiridothea megalwa, G. O. Sars, Archiv f. Math, og Naturvidensk. 

 iv. 1880, p. 432. 



Glyptotiotus Sabini, Miers, Journ. Linn. Soc. London, Zool. xvi. 1883, 

 pp. 15, 16, pi. i. figs. 3-5. (See Miers for further synonymy.) 



Hab. Circumpolar ; west coast of North America {Miers). 



18. Idotea, Fabricius. 



Analytical Key to the Species o/" Idotea*. 



a. Terminal segment emarginate at its extre- 

 mity 37. I, resecata, Stimpson. 



a'. Terminal segment not emarginate at its 

 extremity, 

 b. Body slender, linear, filiform. 



c. Terminal segment truncate at apex . . 38. /. gracillima, Dana, 

 c'. Terminal segment acute at its extre- 

 mity. 

 d. Postero-lateral angles of terminal 

 segment prominent and separated 

 by a tooth from subtriangular 

 middle portion, which bears a small 



tooth at the middle 39. /. urotoma, Stimpson. 



d', Postero-lateral angles not separated 



by a tooth from middle portion . . 40. 7, rectilineata, Lock- 

 h' . Body oblong-ovate. [ington. 



c. Terminal segment regularly rounded, 



■with small median point 41, I. Wosnesenskii, 



d . Terminal segment triangulate poste- [Brandt. 



riorly, with subparallel sides, 

 d, Epimera of second, third, and fourth 

 segments short, not reaching the 

 post-lateral angles of their respec- 

 tive segments 42. I. ochotensis, Brandt, 



d' . Epimera of all the segments reaching 

 the post-lateral angles of their re- 

 spective segments. 



e. Sides of thorax arcuate 43, /, ste7iops, Benedict. 



e'. Sides of thorax more nearly 



parallel 44, I. Whitei, Stimpson. 



37. Idotea resecata, Stimpson. 



Idotea resecata, Stimpson, Bost. Journ. Nat. Hist. vi. 1857, p. 64, 

 pi, xxii. fig, 7; Proc, Bost, Soc, Nat, Hist, 1859, p, 88; Miers, 

 Journ. Linn. Soc. London, Zool. xvi. 1883, p. 45. 



* See Miers, Journ. Linn. Soc. London, Zool. xvi, 1883, p. 43. 



