46 ME. E. J. MIEES ON THE IDOTEID^. 



example in the Museum collection I5 inch (34 millim.), breadth 

 nearly 5 inch (8 millim.). 



Sab. West coast of IST. America. Stimpson's type was dredged in 

 the Straits of Da Fuca, opposite Eort Townsend (Capt. Murden). 



There are in the British-Museum collection two males, pre- 

 served in spirit, from the Grulf of Greorgia, near Orcas Island 

 (Admiralty), and a small example, in spirit, from Yancouver 

 Island (Boundary Commission), that I refer to this species. 



Idotea hecttca. 



Oniscus hecticuSj Pallas, Spicil. Zool. i. (fasc. 9) p. 61, pi. iv. fig. 10 



(1772). 



Asellus hecticus, Olivier, Encycl, Meth, iv. p. 255 (1789). 



Idotea hectica, Latr. Hist. Nat. Crust, et Ins. vi. p. 371 (1803) j Lam. 



Hist, des Anim. sans Vert. v. p. 160(1818); 1 M.-Edw. Hist. Nat. 



Crust, iii. p. 133 ( 1840); id.lCr. in Regne Anim, de Cuv. pi. Ixix. fig. 1 ; 



White, List Cr. Brit, Mus. p. 95 (1847); Lucas, Anim. artic. in 



Expl. Sci. Algerie, Cr.ip. 62 (1849); Heller, Verhandl. zool.-bot. 



Vereins Wien, xvi. p. 727 (1866); Stalio, Att, Istit, Venet. (ser. 5) 



iii. p. 1352 (1876-77). 

 Idotea viridissima, Risso, Cr. des environs de Nice, p. 136, pi. iii. fig. 8 



(1816). 

 Gonotus viridis, Rajinesque- Schmaltz, Precis des dec, Somiologiques, 



p. 26 (1814). 

 Stenosoma hecticum, Desm. Consid, Cr, p. 291 (1825). 

 Armida viridissima, Risso, Hist. Nat. Eur, merid. v. p. 109 (1826). 

 ? Stenosoma viridula, Costa, Cr. in Fauna del E. Napoli, pi. iv. tig. 7 



(1838); Hope, Cat. Cr, Ital, p. 26 (1851). 

 ? Stenosoma eruginosa, Costa, t,c, pi. iv. fig. 6 (1838); Hope, t, c. 



p. 26 (1851). 



Body elongated, narrow-oblong, but slightly narrowed towards 

 the head, with a longitudinal median keel along the dorsal mar- 

 gin, which is obsolete on the terminal postabdominal segment. 

 Anterior margin of the head with a deep, almost semicircular 

 excavation ; its antero-lateral lobes (in a dorsal view) broad and 

 obtuse. Thoracic segments (the first excepted) of nearly equal 

 length, with their posterior margins sinuated, and their postero- 

 lateral angles scarcely acute ; the first segment much shorter and 

 deeply excavated anteriorly for the reception of the head. Post- 

 abdomen (in the Museum examples) about equalling in length 

 the four posterior thoracic segments, with the first two segments 

 quite distinct ; the terminal segment somewhat depressed above, 

 with a semicircular emargination at its distal end, and the postero- 



