364 



BULLETIN 54, UNITED BTATES NATIONAL MUSEUM. 



IDOTHEA BALTICA (Pallas) 



Oniscus balticus Pallas, 8pic. Zool. (9), 1772, pp. 67-68, pi. iv, fig. 6. 

 Idotea entomon Pennant, Britisli Z.iol., IV, 1877, p. 25, pi. xviii, fig. 5. 

 Stenosoma irrorata Say, Journ. Acad. Nat. Sei. Phila., I, 1818, p. 423. 

 Idotea tncuspidata Desmarest, Diet, des Sci. Nat., XXVIII, 1823, p. 373, pi. xlvi, 

 fig. 11; Consid. Crust., 1825, p. 289, pi. xlvi, fig. 11.— Roux, Cr. de la Medi- 

 terranee, 1828, pi. xxix, figs. 11, 12. — Gould, Rep. Geol. Mass., 2d ed., 1835, 

 p. 549.— Milne Edwards, Hist. Nat. Crust., Ill, 1840, p. 129. 

 Idotea irrorata Milne Edwards, Hist. Nat. Crust., Ill, 1840, p. 132. 

 Stenosoma irrorata Gould, Rep. Invert. Massachusetts, 1841, p. 338. — De Kay, 

 Zool. New York Fauna, Crust., Pt. 6, 1844, p. 43, pi. x, fig. 42. 



Idotea irrorata, Stimpson, Smithsonian Contribu- 

 tions to Knowledge, VI, 1853, p. 39. — Leidy, 

 Journ. Acad. Nat. Sci. Phila., 1855, p. 150. 

 Idotea tricui^pidata Sars, Forh. Vidensk. Selsk. 

 / / ^— i— ' A,, J Christ., 1859, p. 151. — Norman, Report British 



^-M ^-^^^ fCy Assoc, 1868, p. 197. — Bate and Westwood, 



British Sessile-eyed Crust., II, 1868, p. 379. 

 Idotea irrorata Harger with Verrill, Report U. S. 

 Fish Comm., 1873, Pt. 1, p. 569, pi. v, fig. 23; 

 p. 316. — Verrill, Am. Journ. Sci. Arts (3), 

 VII, 1874, pp. 131, 134; Proc. Amer. Assoc, 

 1874, pp. 369, 371, 373.— Whiteaves, Am. 

 Journ. Sci. Arts (3), VII, 1874, p. 217. 

 Idotea tricnspidata Stebbing, Journ. Linn. Soc 



London, Zool., XII, 1874, p. 148. 

 Idotea irrorata. Harger, Proc U. S. Nat. Mus., II, 

 1879, p. 160; Report U. S. Fish Comm., Pt. 

 6, 1880, p. 343, pi. v, figs. 24-26. 

 Idotea marina Miers, Journ. Linn. Soc London, 

 Zool., XVI, 1883, pp. 25-31.— Richardson, 

 Proc U. S. Nat. Mus., XXIII, 1901, p. 540. 

 Idotea tricuspidata'Doi.i.Fvs, Feuillesdes jeunes Na- 

 turalistes, 24th year 1893-1895, p. 55. 

 Idotea haltica Sars, Crust. Norway, II, 1899, pp. 80-81, pi. xxxii. — Norman, Ann. 



Mag. Nat. Hist. (7), XIV, 1904, pp. 441-442. 

 Idotea marina Paulmier, Bull. New York State Museum, 1905, pp. 175-176. 



Localities. — Atlantic coast from Nova Scotia and Gulf of St. Law- 

 rence to North Carolina; Bermudas; Barbados; also Mediterranean, 

 Black, and Caspian seas; west coast of Europe to Great Britain; 

 shores of the Netherlands; in German Ocean and Baltic Sea; Bohus- 

 lan, Sweden (W. Sachs); Runmaro, Stockliolms skaroard (J. Lindahl); 

 on Scandinavian and Finland coasts; South America, at Desterro and 

 Rio Janeiro, Brazil; New Zealand; Red Sea; Java. 



Found on surface, on Hoatintr seaweed, among- alga? and eelgrass, 

 in sand and gravel; from stomach of smelt, Osmerus hiordax. 



Depth. — Surface to 111> fathoms, 



c I have accepted the name adopted by Sars for this form, Oniscus marinus Lin- 

 nieus being more properly applied to a species belonging to the genus Jxra, as Sars 

 has suggested. Although Oiuseun tridens Scopoli is earlier than Oniscus balticus, it 

 probably refers to another species of Jdoihea, as Dollfus has pointed out. 



Fig. 394. — Idothea baltica 

 (After Harger). x 2. 



