Pvn H,i I'UitlS

TAPES. 357
hinge or posterior side :
pallial scar broad and polished, deeply
and widely sinuous at the posterior end : muscular scars trian-
gular, large, and also polished. L. 1-5. B. 1*7.
Var. 1. perforans. Shell more or less distorted, and either
longer, broader, or shorter than usual, or having the anterior
Mont. Test. Brit,
margin abruptly truncate. Venus perforans,
p. 127,
t. 3. f. 6.
Var. 2. ovata. Shell more convex, longer, and contracted
at each end.
Var. 3. oblonga. Shell much broader, being more produced
at each end.
Var. 4. plagia. Shell more produced at the posterior side,
which bends upwards (as in Lutraria elliptica,
var. oblonga).
the anterior margin having a corresponding curve and being
obliquely truncate. Venus plagia, Jeffr. in Ann. Nat. Hist,
vol. xix. p. 313.
Habitat :
gineus ;
Equally common and diffused, with T. vir-
but it is usually littoral, living in muddy gravel
or sand, and is seldom found below 7 or 8 fathoms. It
occurs in the Clyde, Belfast, and Sussex tertiary beds.
The T. perovalis of Searles Wood from the Coralline
Crag scarcely differs from the present species. Var. 1.
In crevices of rocks, and in deserted holes of Pholades
and Saxicava arctica, generally attached by a byssus,
from Unst to Jersey. Var. 2. Exmouth (Clark) ; Cork
(Humphreys). This is analogous to the variety Sar-
niensis of the last species. Var. 3. Cork (Wright);
Bundoran, co. Donegal (J. G. J.); Shetland (Barlee).
Var. 4. Lerwick and Deal Voe (J. G. J.). T. pullastra
inhabits the coasts of Norway, South Sweden, and Den-
mark, and those of the north and west of France ; and
(as Venus geographica, which I consider a variety of the
same species) it is spread over all the sea-bed lying be-
tween Gibraltar and the Morea. It is also one of the
Uddevalla fossils.
According to Montagu these shells are called " pull-