IfiO PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Idotea irrorata Edwards, Hist. nat. des Crust., tome iii, p. 132, 1840. — Stcnosoma hro- 

 rata Say, Jour. Acad. Nat. Sci. Phil., vol. i, p. 423, 1818. — Idotea triciispidata 

 Desmarest, Diet, des Sci. nat., tome xxviii, p. 373, 1823; Consid. Crust., p. 289, 

 1825. 



This species is commoD tlirougliout the coast of Kew England, but is 

 more abundant 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 Euroi)ean 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. Fisli 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 Scandinavie, etc.. Atlas, pi. xxvi, fig. 3 a^, 1849. 



A pelagic species. 



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

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

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



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

 in from 16 to 190 fathoms. Also from George's Bank. 



Synidotea bicTispida = /(r/ofm bicuspkla Owen, Voyage of the Blossom, Crustacea, p. 

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

 Boston, vol. i, p. 296, pi. 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 principally 

 upon the work of Messrs. Streets and Kingsley in the Bulletin of the 

 Essex Institute, vol. ix, \). 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. £6, 

 1874. — Stenosoma filiformis 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, Kew Jersey, and Noank, Conn. The species will 

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

 shore of Jfew England. 



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

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



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

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



