ACEPHALA. 21 
T. proxrma, Brown. F.et H. Sanguinolaria sordida, 
Gould. TT. sordida, Couth. Migh. T. calcarea, Lyell, 
ete. — Corall. Eastport to Cape Cod. 
T. renera, Say, 1821. Gould, 68, f.44.— Lamin. Low 
water to 14 f. sand and pebbles. Cape Ann to N. Y. 
T. renta, Say. Gould, 67, f.43.— Lamin. From Cape 
Cod southward. 
T. verstcotor, Cozzens. Dekay. Lins. — Lamin. 
Long Island Sound. 
T. e.ucens, Migh., Bost. Proc. i. 188. — Maine. 
SOLEMYADZ. 
Sotemya vetum, Say, 1821. Gould, 35.— Litt. and 
Lamin. Whole Coast. 
The animal has the mantle closed except at a large 
opening, with cirrated edges anteriorly, for the passage 
of the foot, and at a single small opening at the pos- 
terior extremity, also cirrated. Foot large, truncated 
and excavated at its extremity, which has fimbriated 
edges. Branchie consisting of a very thick lobe on 
each side, situated far posteriorly, and having a lon- 
gitudinal sulcus at the middle in each. Palpi very 
small and slender. The thinness of the shell ena- 
bles the animal to make surprising leaps, and I have 
seen it leaping or swimming about in the water for 
some time without touching the bottom. The leap 
is performed by suddenly drawing in the umbrella- 
shaped foot at the same time that water is expelled 
from the posterior opening by the closing of the 
valves. 
S. sorEauts, Tott. Gould, 36.— Lamin. Whole Coast. 
