MARINE ISOPODA OF NEW ENGLAND, ETC. 315 



is represented in our limits by a single species, I have not been able to 

 separate the generic from the specific characters with confidence, and 

 have therefore described the species without attempting it. 



Jaera albifrons Leacb. 



" Oniscus albifrom Montague MSS." (Leach). 



Jcera albifrons Leach, YA. Encjc, vol. vii, p. " 434" (Am. ed., p. 273), "1813-14"; 

 Traus. Liun. Soc, vol. si, p. 373, 1815. 

 Samouelle, Ent. Comp., p. 110, 1819. 

 Desmarest, Diet. Sci. nat., tome xxviii, p. 381, 1823; Conaid. Crust., p. 316, 



1825. 

 Latreille, Regne Auim., tome iv, p. 141, 1829. 

 Edwards, Anuot. de Lamarck, tome t, p. 267, 1838; Hist. nat. des Crustf., 



tome lit, p. 150, 1840; Riigne Anim., Crust., p. 204, 1849. 

 Moore, Chailesworth's Mag. Nat. Hist., n. s., vol. ill, p. 294, 1839. 

 Thompson, Ann. Mag. Nat. Hist., vol. xx, p. 245, 1847. 

 White, List Crust. Brit. Mus., p. 97, 1847 ; Brit. Crust. Brit. Mus., p. 69, 



1850; Pop. Hist. Brit. Crust., p. 231, 1857. 

 Lilljeborg, Ofvers. Vet-Akad. Forh., Arg. viii, p. 23; 1851; ibid., Arg. ix. 



p. 11,1852. 

 Gosse, Man. Mar. Zool., vol. i, p. 136, fig. 243, 1855. 

 M. Sars, Christ. Vid. Selsk. Forh., 1858, p. 153, 1859. 

 Bate, Rep. Brit. Assoc, 1860, p. 225, 1861. 

 G. O. Sars, Keise ved Kyst. af Christ., p. (29), 1866 ; Christ. Vid. Selsk. 



Forh., 1871, p. 272, 1872. 

 Norman, Rep. Brit. Assoc, 1866, p. 197, 1867; ibid, 1868, p. 288, 1869. 

 Bate and Westwood, Brit. Sess. Crust., vol. ii, p. 317, figure, 1868. 

 Metzger, J. B. Naturhist. Ges. Hannover, xx, p. 32, 1871 ; Nordseefahri; 



der Pomm., 1872-'3, p. 285, 1875. 

 Paxfitt, Trans. Devon. Assoc, 1873, p. (18), " 1873." 



Stebbing, Jour. Linn. Soc, Zool., vol. xii, p. 149, 1874; Ann. Mag. Nat. Hist., 

 IV, vol. xvii, p. 79, pi. v, figs. 5-6, 1876; Trans. Devon. Assoc, 1879 p. 

 (7), 1879. 

 Meinert, Crust. Isop. Amph. Dec. Dan.,p. 80, "1877." (Taira.) 

 Harger, Proc. U. S. Nat. Mus.,' 1879, vol. ii, p. 158, 1879. 

 Jcera Kroyeri Zaddach, Syn. Crust. Pruas. Prod., p. 11, "1844" (Ji, JSroym Ed- 

 wards ?). 

 Jmra baltica Fried. Miiller, Arch. Naturg., Jahrg. xiv, p. 63, pi. iv, fig. 29, 1848. 

 Jcera copiosa Stimpson, Mar. Inv. G. Manan, p. 40, pi. iii, fig. 29, 1853. 

 Packard, Canad. Nat. and Geol., vol. viii, p. 419, 1863. 

 Verrill, Am. Jour. Sci., Ill, vol. vii, p. 131, 1874; Proc. Amer. Assoc, 



1873, p. 369, 1874 ; This Report, part i, p. 315 (21), 1874. 

 Harger, This Report, part i, p. 571 (277), 1874. 

 Jcera nivalis Packard, Mem. Bost. Soc. Nat. Hist., vol. i, p. 296, 1867 (J. nivalis 



Kroyer ?.) 

 Asellus Grdnlandicws Packard, loc cit. {not of Kroyer). 

 Jcera marina Mobius, Wirbellos. Thiere der Ostsee, p. 122, 1873 ; Ann. Mag. 



Nat. Hist., IV, vol. xii, p. 85, 1873. (J. marina Fabricius ?.) 

 Jaera maculata Parfitt, Traus. Devon. Assoc, 1873, p. "253" (IS), "1873." 

 Stebbing, Traus. Devon. Assoc, 1879, p. (7) 1S79, {albifrons). 



Plate I, Figs. 4-8. 



This species is at once distinguished from the other marine Isopoda 

 of our coast by the short uropods, arising from a notch in the end of the 



