PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 121 



Gammarus annulatus Smith, Iiiv. V. S., p. r>;j7, 1874. 



Shore and flats at low water, and eel-grass ; abundant. 



Gammarus mucronatus Say, Jouru. Phila. Acad., vol. i, p. 376, 1818. Smith, Inv. 

 V. S., p. 559, 1874. 



Shore and flats at low water; very abundant. 

 McEra levis Smith, luv. V. S., p. 559, 1874. 



In the eel-grass off the dike. Not hitherto recorded from north of 

 Vineyard Sound. 



Microdeutopus grandimanus Smith. — Autonoe grandimana Bruz., Skand. Amphip, 

 Gamm., ji. 2(3, 1859. — Microdeutopus mvnax Smith, Inv. V. S., \). 5(32, 1874. 



On the shore at low water, in the eel-grass off the dike, and among 

 the sea-weeds on the piles of the wharves. Formerly known on the 

 American coast only from Vineyard and Long Island Sounds. 



Amphithoe longimana Smith, luv. V. S., p. 563, 1874. 



Found at low water and in the eel-grass in one-half fathom. Pre- 

 viously known only from south of Caj)e Cod. 



Corophium cylindricum (Say) Smith, Inv. V. S., p. 566, 1874. 



Eel-grass, one-half fathom. 



Chelura terebrans Philippi. Smith, Proc. U. S. Nat. Mus., vol. ii, p. 232, 1879. 



Abundant in old submerged piles of wharves, associated with Lim- 

 noria Ugnorum and Teredo navalis. First recorded from America in the 

 I)aper of Professor Smith referred to above, but previously found by him 

 at Wood's Holl in 1875. 



Caprella geometrica Say, Journ. Acad. Nat. Sci., Phila., vol. i, p. 390, 1818. Smith, 

 Inv. V. S., p. 567, pi. v, fig. 20, 1874. 



In the eel-grass, one-half fathom, and also obtained from floating sea- 

 weeds in Piovincetown Harbor. Hitherto recorded from south of Cape 

 Cod only, but discovered by the Fish Commission at Quahog Bay, 

 Maine, in 1873. 



ISOPODA. 



Jaera albifrons Leach. Harger, Proc. U. S. Nat. Mus., vol. ii, p. 158, 1879. — Jcsra copi- 

 osa Stimi)son, Mar. Inv. Grand Manan, p. 40, 1853. Harger, Inv. V. S., p. 571, 



1874. 



Very abundant on the shore between tides, under loose stones and 

 other objects; and also in the eel-grass in very shallow water. 



Chiridotea coeca (Say) Harger, Am. Journ. Sci., Ill, vol. xv, p. 374, 1878. 

 Shore, low water; only a few specimens collected. 



Idotea irrorata (Say) Edwards. Harger, Inv. V. S., p. 569, 1874 ; Proc. U. S. Nat. Mus., 

 vol. ii, p. 160, 1879. — Idotea tricmpidata Desm., Diet, des Sci. Nat., tome xxviii, 

 p. 373, 1823. 



Very abundant on the shore, on piles of wharves, in the eel-grass, 

 and swimming at the surface amongst floating sea- weeds. 



