Molluscan Fauna of New England. 285 
terior portion of the opening has small conical a along its 
margit y truncated and 
beveled laterally. 
& 
» shows that it is very different from Anatina, and agrees 
he siphonal tubes are separate from the base, slender, sub-. 
equal; the orifices are both surrounded by a simple row of 
dinal fold on the dorsal side posteriorly. Palpi with the ante- 
weet 
the small antero-ventral opening for the foot. 
In young shells (pl. vii, fig. 1*) the spoon-shaped tooth is 
supported beneath by two slender brace-like lamin, 1n both 
valves; in larger shells one of these usually becomes obsolete. 
This species occurs from New Jersey to t abtador. 
by comparin l. vii ith that of A. tener 
g the figure (pl. vii, fig. 1) with 
(le 2) magnified on ee extent. The ligament plate is 
This species occurred sparingly in Vineyard Sound and 
Buzzard’s Bay, in 6-10 faints sand,—A. E. Vv. and S. 1 
Smith ; it has also been found in Long Island Sound, off New 
Haven, 4-5 fath., mud,—A. E. V. 
