Mr, E, J. IktlERS OIT TflE IDOTEIDJ^.. 35 



slender. Opercular valves large, ueai4y covering the entire under- 

 side of the postabdomen. Length of body 0'75 inch, greatest 

 breadth 0"17 ; length of postabdomen 0"20 inch. 



Hab. Puget Sound (Stimpson). 



I have seen no specimens having tlie peculiar form of the 

 terminal postabdominal segment as described above. In other 

 particulars this species appears to be allied to I. oeJiofensis. 



IdOTEA ? GRA.CILLIMA. 



Stenosoma gracillimum, Dana, Pr. Acad. Nat, Sci. Philad. vii. p. 175 

 (1854); Stimpson, Bost. Journ. Nat. Hist, vi. p. 605 (1857). 



Has, according to Prof. Dana, an extremel}' slender filiform 

 body, with the thoracic segments for the most part subquadrate ; 

 head quadrate. Postabdomen linear, truncated at apex, 3- 

 jointed, third segment marked on each side with a suture. An- 

 tennae a little shorter than half the body, with the flagellum 10- 

 12-jointed, shorter than the peduncle, naked. Legs very short, 

 subequal. Length 5^ lines. 



Loc. California (Dr. J. LeConte). 



This species is very briefly described ; but I have seen no 

 specimens which can be referred to it. 



Idotea metallica. 



Idotea metallica, Bosc, Hist. Nat. Crust, ii. p. 179, pi. xv. fig. 6 (1802) ; 

 Latr. Hist, Nat. Cr, et Ins. vi. p. 373 (1803). 



? Idotea atrata, Costa, Fauna del K. Napoli, Cr. pl.xi. fig. 3 (1838); Hope, 

 Cat. Cr. Ital. p. 26 (1851). 



Idotea rugosa, M.-Edw. Hist. Nat. Crust, iii. p. 131 (1840). 



? Idotea pelopouesiaca, Roux, Cr. de la Mediterranee, pi. xxx. figs. 10, 

 12 (1830); Hope, Cat. Cr. Ital. p. 26 (1851). 



Idotea robusta, Kroyer, Naturhist. Tidsskr. (ser. 2) ii. p. 108 (1846); 

 id.Voy . en Scand., Crust, pi. xxvi. fig.Sj Reinhardt, Forteg. over Gi'on- 

 lands Krebsdyr, p. 35 (1857); Stimpson, Pr. Ac. Nat. Sci. Phil. p. 133 

 (1863) ; Verrill, Am. Journ. Sci. ^- Arts, ii. p. 360 (1871) ; id. Rep. 

 U.S. Fish Commiss. i. p. 439 (1874) ; Harger, same Report, i. p. 569, 

 pi. v. fig. 24 (1874); Proc. U.S. Nat. Mus. ii. p. 160 (1879); Rep. 

 U.S. Fish Commiss. vi. p. 349, pi. vi. figs. 30-32 (1880); Liitken, 

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



Idotea compacta, White, List Crust. Brit. 3Ius. p. 95 (1847). 



? Idotea algirica, Lucas, Anim. artic. in Expl. Sci. Algerie, i. Cr. 

 p. 61, pi. vi. fig. 2 (1849) ; Heller, Verh. zool.-bot. Gesellsch. Wien, 

 xvi. pp. 727, 728 (1866) ; Stalio, Att. Istit. Venet, (ser. 5) iii. p. 1353 

 (1876-77). 



3* 



