Nucula proxima, Say. _
Casco Bay to Eastport.
UV Nucula delphinodonta, Mighels and Adams, 1842.
Casco Bay to Eastport.
Yoldia limatula (Say).
Casco Bay to Eastport.
Yoldia sapotilla (Gould).
Casco Bay to Eastport.
-— Yoldia myalis (Couthouy).
Casco Bay to Eastport.
void thracieformis (Storer), 1837.
Casco Bay to Eastport.
Yoldia lucida (Loven).
Nucula navicularis, Mighels, 184r.
Yoldia obesa, Stimpson, 1851.
Casco Bay; North Haven, Penobscot Bay (Henry
Jackson, Jr.)..
Yoldia frigida, Terell, 1859.
Gulf of Maine, 88 to 92 fathoms, and Jeffreys Ledge
(Verrill).
Yoldia cascoensis (Mighels), 1841.
Casco Bay (Mighels and Chickering).
6


\ Leda tenuisulcata (Couthouy), 1838.
Nucula minuta, Mighels, 1842.
Casco Bay to Eastport.
Leda caudata (Donovan).
Nucula rostrata, Mighels.
Casco Bay, rare (Mighels); Gulf of Maine, 102 fath.
(Verrall):
Arca (Bathyarca) pectunculoides, Scacchi, 1833.
Casco Bay (Kingsley); just outside Casco Bay, 94
fath. and Cashes Ledge, 27 to 90 fath. (Verrill).
Arca (Bathyarca) anomala, Verrill and Bush.
Off Cashes Ledge, 27 fath. (Verrill).
~~ Ostrea virginica, Gmelin.
Ostrea canadensis, Lamarck.
Ostrea borealis, Stimpson, 1851.
(The common oyster. )


This shell-fish was common in the tidal rivers and bays of the
Maine coast, as the Indian shell heaps, notably the one on the
banks of the Damariscotta river, in the town of Damariscotta,
and dead shells still to be found in the beds of the rivers elo-
quently attest. The cause of their dying out on the coast of
Maine has not, to our knowledge, been satisfactorily explained.
