168 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



e. All legs free of spines ^Ega gracilipes Hansen 



e^. Legs furnished with spines. 

 /. Uropoda extend beyond the tip of the aljdomen. 



-Ega mjmynetrica Richardson 

 f. Uropoda do not extend beyond the i\\i of the abdomen. 



jEga ventrosa M. Sars 

 (V. Eyes very small ^Ega microphtliabna Dana 



JE,GA PSORA (Linnaeus). 



Onisciis psora Linn/eus, Fauna suecica, 2ded., 1761, p. 499, No. 2054; Syst. Nat., 

 12th ed., I,' 1767, p. 1060.— O. Fabricius, Fauna Groenlandica, 1780, p. 249. 



jEga eniarginata Leach, Trans. Linn. Soc. London, XI, 1815, p. 370; Diet. Sci. 

 Nat., XII, 1818, p. 349.— Desmarest, Gonsid. Crust., 1825, p. 305, pi. xlvii, 

 figs. 4-5. 



JEga entaiUce Latreille, Regne Anim., IV, 1829, p. 134. 



^ga emarginata Gould, Rept. Geol. Mass., 1835, p. 549. 



J^]ga {Oniscus psora) Ki?0yer, Dansk. Vid. Selsk. Afh., VII, 1838, p. 318. 



JSga emarginata Milne Edwards, Hist. Nat. Crust., Ill, 1840, p. 240. — Gould, 

 Invert. Mass., 1841, p. 338. — Milne Edwards, Regne Anim. Crust., 1849, 

 pi. IV, fig. 4; pi. Lxvii, fig. 1. 



jEga psora Lilljeborg, Ofvers. Vet.-Acad. Forh., VII, 1850, p. 84; VIII, 1851, p. 

 24.— LtJTKEN,Vidensk.Meddel., 1859, pp. 65, 179; 1861,p.l81 (7).— Schicedte, 

 Ann. Mag. Nat. Hist. (4), I, 1868, p. 12. — Bate and Westwood, British Sessile- 

 eyed Crustacea, II, 1868, p. 283.— M. Saes, Chr. Vid.-Selsk. Forh., 1869, 

 p. 261.— G. O. Sars, Chr. Vid.-Selsk. Forh., 1872, p. 275 (32).— Verrill, 

 Am. Jour. Sci. (3), V, 1873, p. 16. — Smith and Harger, Trans. Conn. Acad. 

 Sci., Ill, 1874, p. 22. — LtJTKEN, Crustacea of Greenland, 1875, p. 150. — 

 Meixert, Naturh. Tidsskr. (3), XI, 1877, p. 89.— Miers, Ann. Mag. Nat. 

 Hist. (4), XIX, 1877, p. 134.— Harger, Proc. U. S. Nat. Mus., II, 1879, 

 p. 161; Report U. S. Commissioner of Fish and Fisheries, Pt. 6, 1880, pp. 384- 

 387, pi. X, fig. 64 (see Harger for synomymy). — Schicedte and Meixert, 

 Nat. Tidsskr. (3), XII, 1879-80, pp. 357-360, pi. viir, figs. 5-6.— Miers, 

 Journ. Linn. Soc. London, ZooL, XV, 1881, pp. 65-66. — Hansex, Videnska- 

 belige Meddelelser fra den naturh istoriske Forening i Kjgbenhavn, 1887- 

 1888, p. 183.— Sars, Crust, of Norway, II, 1899, p. 59, pi. xxiv.— Richardson, 

 American Naturalist, XXXIV, 1900, p. 218; Proc. U. S. Nat. Mus., XXIII, 

 1901, p. 521.— Axel Ohlin, Bihang till K. Svenska Vet.-Akad. Handl., 

 XXVI, Afd. IV, 1901, pp. 22-23. 



Local/tit. s. — Otf Marthas Vineyard; Georg-es Bank; Browns Bank; 

 Fishers Island Sound; La Have Bank; Gulf of Maine; Western Bank; 

 Gloucester; Sable Island Bank; between Peters Bank and Banque- 

 reau; Nova Scotia; Grand Bank; Newfoundland; Gulf of S"t. Latvrence; 

 Nakvak, Labrador; Holstensl)org, Nanortalik, Ivigtut, Jidianehaab, 

 Arsukfjord, (jodhavn, Kgedesminde, Ikerasak, and Unianek, Green- 

 land; North Greenland in Davis Straits; Hudsons Ba}^; also Ireland; 

 British Isles; North Sea; Fiiunark; Iceland; BjonensBay; Spitzberg-en; 

 in the German Sea; Kattegat; between the delta of the Mississippi and 

 Cedar Keys, Florida; latitude 43° 34' north, longitude 49° west; lati- 

 tude 43° 25' north, longitude 59° 50' west; latitude 42° 47' north; 

 longitude 65^ 30' west. 



Depth.— 3()-i\4:0 fathoms. 



