'384 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



wEga psora Kroyer (Linn6). 



Oniscua psora "Lirm^, Fauna suecica, ed. ii, 1761"; Syst. Nat., ed. xii, torn, i, 

 p. 1060, 1767. 



"Pennant, Brit. ZooL, vol. iv, pi. 18, fig. 1, 1777 (certe)" (B. »feW.). 



O. Fabricius, Fauna Grccnlaudica, p. 249, 1780. 



Mohr, Islandisk Naturhistorie, p. 110, 1786. 

 ^{/a emarginata Leach, Trans. Linn. Soc, vol. xi, p. 370, 1815; Diet. Sci. nat., 

 tome xii, p. 349, 1818. 



Samonelle, Ent. Comp., p. 109, 1819. 



Desmarest, Cousid. Crust., p. 305, pi. 47, figs. 4, 5, 1825. 



Griffith and Pidgeon, Nat. Hist. Crust., p. 218, pi. viii., fig. 3, 1833. 



Edwards, Hist. nat. des Crust., tome iii, p. 240, 1840 ; Regne Anim., Crust., 

 pi. iv, tig. 4, and pi. Ixvii, fig. 1, 1849. 



Gould, ?Rep. Geol.Mass., p. 549, 1835; Invert. Mass., p. 338, 1841. 



Gosse., Man. Mar. ZooL, vol. i, p. 134, 185*. 

 ^(/a {Oniscus psora) Kroyer, Gronlands Amfipoder, p. 318, 1838, 

 xEga iisora Lilljeborg, Ofvers, Vet. -Acad. Fiirh., 1850, p. 84, and 1851, p. 24. 



Lvitken, Vidensk. Meddel., 1858, pp.65, 179,1859; ibid., 1860, p. 181(7) 

 1861; Crustacea of Greenland, p. 150, 1875. 



ScModte, Ann. Mag. Nat. Hist., IV, vol. i, p. 12, 1868. 



Bate & Westwood, Brit. Sess. Crust., vol. ii, p. 283, figure, 1868. 



M. Sars, Chr. Vid. Selsk. Forh., 1868, p. 261, 1869. 



G. O. Sars, Hard. Fauna, Crust., p. 275 [32], 1872. 



Verrill, Am. Jour. Sci., Ill, vol. v, p. 16, 1873. 



Smith and Harger, Trans. Conn. Acad., vol. iii, p. 22, 1874. 



Whiteaves, Further Deep-Sea Dredging, Gulf St. Lawrence, p. 15, " 1874." 



Metzger, Nordseelahrt der Pomm., p. 285, 1875. 



Meinert, Crust. IsoiJ. Ami)h. Dec. Danise, p. 89, "1877." 



Miers, Ann. Mag. Nat. Hist., IV, vol. xix, p. 134, 1877. 



Harger, Proc. U. S. Nat. Mus., 1879, vol. ii, p. 161, 1879. 

 JE(ja entaillcc Latreille, R^gue Anim., tome iv, p. 134, 1829. 



* 

 Plate X, Fig. 64. 



The present si^ecies is the largest Isopod, and indeed the largest 

 Tetradecapod known on the N^ew England coast, reaching a length of 

 nearly or quite two inches and a breadth of one inch, and has even at- 

 tained to the dignity of a popular name, "salve-bug", by which it is 

 known among tishermeu. It may be further distinguished by its large 

 approximate eyes, covering a large proportion of the upper surface of 

 the head, and by the possession of ancoral legs in three pairs only, the 

 last four pairs of legs being fitted for walking. 



The body is oval, broadest at the fourth and fifth thoracic segments, 

 where the breadth is about half the length. The dorsal surface is 

 moderately convex and smooth except for minute and rather scat- 

 tered punctatious, which occur also on the legs, especially on the basal 

 segments, on the antennul^e, the uroi)ods, and even the pleopods. 

 The head is transverse and sub-triangular, salient in front between 

 the bases of the antennulte. Much of the upper surface of the head is 

 covered by the large oval or somewhat renilorm eyes, which do not quite 

 meet on the median line. The autennulte when bent backward nearly 

 or quite attain the anterior margin of the first thoracic segment, and 



