554 PROCEEDINGS OF THE NATIOXAL MVSEVM. voi,.xx.n. 



S2. J^^RA Leach. 

 126. JyERA MARINA (Fabricius). 



Onisnis marinus Fabricius, Fauna Gronlandica, p. 252. 



Oniscus alhifroits Monta<;u, manuscript (Leach). 



J.rra albifrons Leach, Ed. Encyc, VII, 1813-14, p. 434 (Am. ed., p. 273); 

 Trans. Linn. Soc, XI, 1815, p. 373.— Desmarest, Diet. 8ci. Nat., XXVIII, 

 1823, p. 381; Consid. Crust., 1825, p. 31fi.— Latreille, Regne Anim., IV, 

 1829, p. 141.— Edwards, Annot. de Lamarck, V, 1838, p. 267; Hist. Nat. des 

 Crust., Ill, 1840, p. 150; Rcgne Anim., Crust., 1849, p. 204.— Lill.ieborc., 

 Ofvers. vet. Akad. Forh., VIII, 1851, p. 23; IX, 1852, p. 11.— M. 8ars, 

 Christ. Vid. Selsk. Forh., p. 153, 1859.- B.\te, Rep. Brit. Assoc, 18H0, 

 p. 225, 1861.— G. 0. Sars, Reise ved Kyst. of Christ., 1866, p. 29; Christ. 

 Vid. Selsk. Forh., 1871, p. 272, 1872.— Norman, Rep. Brit. Assoc, 1866, 

 p. 197, 1867; 1868, p. 288, 1869.— Bate and Westwood, Brit. Sess. Crust., 

 JI, 1868, p. 317, fig. — Stebbing, Jour. Linn. Soc Lond., Zool., XII, 1874, 

 p. 149; Ann. Mag. Nat. Hist. (4), XVII, 1876, p. 79, pi. v, figs. 5, 6; Trans. 

 Devon. Assoc, 1879, p. 7. — Meinert, Crust. Isop. Amph. Dec. Dan., 1877, 

 p. 80.— Harger, Proc U. S. Nat. Mus., 1879, II, p. 158; Report U. S. Com- 

 missioner of Fish and Fisheries, 1880, Pt. 6, pp. 315-318, pi. i, figs. 4-8. (See 

 Harger for synonymy. ) 



Jasra kroyeri Zaddach, Syn. Crust. Pruss. Prod., 1844, p. 11. 



Jasra baltica Fried. MtJLLER, Arch. Naturg., XIV, 1848, p. 63, pi. iv, fig. 29. 



Jxra copiosa Stimpson, Mar. Inv. Grand Manan, 1853, p. 40, pi. in, fig. 29.- — Ver- 

 RiLL, Am. Jour. Sci. (3), VII, 1874, p. 131; Proc. Amer. Assoc, 1873, 11. 369, 

 1874; Report U. S. Commissioner of Fish and Fisheries, 1874, Pt. 1, p. 

 315 (21). — H.^rger, Report U. S. Commissioner of Fish and Fisheries, 1874, 

 Pt.l, p. 571(277). 



Jiera nivalis Packard, Mem. Bost. Soc Nat. Hist., 1, 1867, p. 296. 



AseUus grdnlandlcus Packard, Mem. Bost. Soc. Nat. Hist., 1, 1867, p. 296. 



Jxra marina Mobius, Wirbellos. Thiere der Ostsee, 1873, p. 122; Am. Mag. Nat. 

 Hist. (4),XII, 1873,p. 85. 



Jsira maculata Parfitt, Trans. Devon. Assoc, 1873, p. 253 (18). — Stebbing, Trans. 

 Devon. Assoc, 1879, p. (7). 



Jxra marina Sars, Crust, of Norway, II, Pt. 1, 1897, p. 104. 



Ilahitat. — Whole coast of New England; Labrador; Bay of Fundy; 

 also coasts of England, Scotland, Finmark, and all the coasts of the 

 North Sea; Germany. 



Depth. — Found on surface. 



S3. lANTHE Bovallius. 



analytical key to the species of ianthe. 



o. Rostrum as long as head. Flagellum of first pair of antenna? 12-articulated, shorter 

 than breadth of head. Flagellum of second pair of antennfe 50-artieulated. 

 First thoracic segment shorter than second. Second and third segments equal, 

 longest, much longer than seventh. Terminal segment smooth on dorsal side, 

 without spine-like tubercle. Peduncles of uropoda longer than postero- lateral 

 angulations of terminal segment 127. Ianthe spinosa (Harger). 



a'. Rostrum much longer than head. Flagellum of first pair of antennie 60 to 70 

 articulated, nearly as long as breadth of head. Flagellum of second pair of 

 antennse 280-articulated. First thoracic segment as long as second. Seventh 

 segment is longest. Terminal segment with a single spine-like tubercle on its 

 dorsal side. Peduncles of uropoda shorter than postero-lateral angulations of 

 terminal segment of body 128. lantJie speciom Bovallius. 



