PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 159 



forward aiouiul the sides of the liead; the second, third, and fourth 

 segments usually present two serrations, both the anterior and posterior 

 angles being produced and acute, and the last three segments are pro- 

 duced and directed more and more backward. In the dorsal region, 

 each segment bears a pair of sharp tubercles or spines. Anteaiorly these 

 spines are near the front margins of the segments and directed forward, 

 but become posteriorly more erect and nearer the middle of the segment, 

 and the last three pairs are directed backward, the last i)air being near the 

 hinder margin of the seventh segment. The legs are slightly spiny, the 

 first pair but little thickened in the females. The pleon tapers at the 

 sides, where it is minutely serrulate. Its posterior angles are salient and 

 acute, like the anterior angles of the head. The uropods are of moderate 

 length, about as long as the pleon, and comiDosed of a cylindrical basal 

 segment, bearing two rami, of which the inner is somewhat the larger, 

 and nearlj' as long as the basal segment. Both, together with the basal 

 segment, are sparingly bristly. 



The col6r in alcohol is nearly white. Length 8""'. 



Two specimens of this species were collected at Banquereau by Cap- 

 tain Collins, of the schooner Marion, August 25, 1878. They were found 

 adhering to the cable of the schooner. 



Munna Fabricii Kroyer, Naturhist. Tidssk., II, Biud ii, p. 380, 1847 ; Gaimard's Voyage 

 eu Scandiuavie, etc., Atlas, jjI. 31, figs. 1 a-q, 1849. 



Casco Bay, near Portland, Me., Eastport and Western Bank, from low 

 water "to 150 fathoms. 



Munnopsis typica M. Sars, Christiania Vidensk. Selsk., 1860, p. 84, 18(31; Bidrag til 

 Kundskab om Christiania Fjordens Fauna (Nyt Magazin), p. 70, pi. vi, vii, 

 figs. 101-138, 1868, 



This species has been taken in the Bay of Fundy in GO fathoms; also, 

 by Mr. J. F. Whiteaves, in the Gulf of Saint Lawrence. 



Biuycope robusta Harger, Anj. Jour. Sci., Ill, vol. xv, p. 375, 1878. 



J^ot yet found south of the Gulf of Saint Lawrence, where it was taken 

 by Mr. J. F. Whiteaves in 220 fathoms, muddy bottom. 



Chiridotea coeca Harger, Am. Jour. Sci., Ill, vol. xv, p. 374, 1878. — IdoteaccccaSay, 

 Jour. Acad. Nat. Sci. Phil., vol. i, p. 424, 1818, 



Common on the southern coast of New England, and taken as far 

 north as Halifax in the summer of 1877. 



Chiridotea Tuftsii Harger, Am. Jour. Sci., Ill, vol. xv, p, 374, 187S.—Idotea Tufitii 

 Stimpson, Mar. Invert. Grand Manan, p. 39, 1853. 



This species has been taken at various points along the coast from 

 Long Island Sound to Halifax, but was regarded as rare until the sum- 

 mer of 1878, when it was collected in abundance at Gloucester, Mass. 



