PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 121 
Gammarus annulatus Smith, Inv. V.8., p. 557, 1874. 
Shore and flats at low water, and eel-grass; abundant. 
Gammarus mucronatus Say, Journ. Phila. Acad., vol. i, p. 376, 1818. Smith, Inv. 
V.S., p. 559, 1874. 
Shore and flats at low water; very abundant. 
Mera levis Smith, Inv. V. 8., p. 559, 1874. 
In the eel-grass off the dike. Not hitherto recorded from north of 
Vineyard Sound. 
Microdeutopus grandimanus Smith.—Autonoé grandimana Bruz., Skand. Amphip. 
Gamm., p. 26, 1859.—Microdeutopus minax Smith, Iny. VY. 8., p. 562, 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. 
Amphithoé longimana Smith, Inv. V.8%., p. 563, 1874, 
Found at low water and in the eel-grass in one-half fathom. Pre- 
viously known only from south of Cape Cod. 
Corophium cylindricum (Say) Smith, Iny. V. 8., p. 566, 1874. 
EKel-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 lignorum and Teredo navalis. First recorded from America in the 
paper of Professor Smith referred to BADONE, 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, pl. v, fig. 20, 1874. 
In the eel-grass, one-half fathom, and also obtained from floating sea- 
weeds in Provincetown Harbor. Hitherto recorded from south of Cape 
Cod only, but discovered by the Fish Commission at Quahog Bay, 
Maine, in 1873. 
ISOPODA. 
Jeera albifrons Leach. Harger, Proc. U.S. Nat. Mus., vol. ii, p. 158, 1879.—Jera copi- 
osa Stimpson, Mar. Inv. Grand Manan, p. 40, 1853. Harger, Inv. V.8., 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 ceca (Say) Harger, Am. Journ. Sci., III, 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.—IJdotea tricuspidata Desm., Dict. 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. 
