160 PKOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Idotea irrorata Edwards, Hist. nat. des Crust., tomo iii, p. 132, 1840. — Stenosoma irro- 



rafa Say, Jour. Acad. Nat. Sci. Phil., vol. i, p. 42.3, 1818. — Idoiea iricusjndata 



Desmarest, Diet, des Sci. nat., tome xx\'iii, ji. 373, 1823; ConsitL Crust., p. 289, 



182o. 



This species is commoD throughout the coast of New Enghxiul, but is 



more abuudaut southward, being to a great extent rephiced toward the 



north by the next species. 



A comi^arison of English and European specimens with our own 

 leaves no doubt of the identity of the species on the opposite coasts of 

 the Atlantic. Being a common European species, it has been mentioned 

 by many authors under a variety of names, which are more fully quoted 

 and discussed in the report. Say's name appears to be the earliest that 

 can be certainly connected with the species. 



Idotea phosphorea Harger, Rep. U. S. Fish Com., part i, p. 569 (275), 1874. 

 Found throughout the coast, but more abundant northward. 



Idotea robusta Kroyer, Naturhist. Tidssk., II, Bind ii, p. 108, 1846; Gaimard's Voyage 

 en Scaudiuavie, etc., Atlas, pi. xxvi, fig. 3 a-r, 1849. 



A pelagic species. 



Synidotea uodulosa Harger, Am. Jour. Sci., Ill, vol. xv, p. 374, 1878. — Idothea nodulosa 

 Kroyer, Naturhist. Tidssk., II, Biud ii, p. 100, 1846; Gaimard's Voyage en 

 Scaudiuavie, etc.. Atlas, pi. xxvi, fig. 2, 1849. 

 A northern species, found at Halifax, JST. S., and 125 miles southward, 



in from 10 to 190 fathoms. Also from George's Bank. 



Synidotea bicuspida = /rfofm hicuspida Oweu, Voyage of the Blossom, Crustacea, p. 

 92, pi. xxvii, fig. 6, 1839. — Idotcea marmorata Packard, Mem. Soc. Nat. Hist. 

 Boston, vol. i, p. 296, jd. viii, fig. 6, 1867. — Idotea pulchra Lockington, Proc. 

 Cal. Acad. Sci., vol. vii, p. 45, 1877. 



The determination of the synonymy of this species rests i^rincipally 

 ui^on the work of Messrs. Streets and Kingsley in the Bulletin of the 

 Essex Institute, vol. ix, p. 108, 1877. It has not yet been found south 

 of the Grand Bank. 



Erichsonia filiformis Harger, Rep. U. S. Fish Com., part i, p. 570 (276), pi. vi, fig. SIG, 

 1-^74. — Stenosoma JiUformis Say, Jour. Acad. Nat. Sci. Phil., vol. i, p. 424, 1818. 



A southern species, not yet found north of Cape Cod. 



Erichsonia attenuata Harger, Rep. U. S. Fish Com., part i, p. 570 (276), pi. vi, fig. 27, 

 1874. 



Great Egg Harbor, New Jersey, and Noank, Conn. The species will 

 probably be found at other localities, among eel -grass, on the southern 

 shore of New England. 



Epelys trUobus Smith, Rep. U. S. Fish Com., parti, p. 571 (277), pi. vi, fig. 28, 1874.— 

 Idotea triloba Say, Jour. Acad. Nat. Sci. Phil., vol. i, p. 425, 1818. 



A southern species, rare north of Cape Cod, but extending, with some 

 other southern species, to Quahog Bay, on the coast of Maine. 



