Pvn H,i I'UitlS

362 VENERID.E.
My largest specimen measures two and a half inches in
length by three inches in breadth : others are twisted
and irregular or keeled on the posterior side.
The habitat assigned bv Linne to Venus decussata is
(C O. Indico"; but the description in the ' Mus. Ulr.
Keg./ as well as those in the 10th and 12th editions of
the f
Syst. Nat./ suit the European shell which now
bears the above specific name. Specimens from the
Indian Ocean cannot be distinguished from this in
form, sculpture^, or colour, although they
are called T.
Indica. The synonyms are numerous ; I have noted
about a dozen. If the name could now be changed, I
would suggest the adoption of that proposed by Da
Costa, viz. " reticulatus." Adansoir's " le Lunot " ap-
pears to be the present species, and not T. pullastra.
Genus III. LUCINOP'SIS • Forbes and Hanley.
PI. VII. f. 1.
Body roundish: mantle having its edges furbelowed or
puckered : tubes separate throughout.
Shell globose, thin, striated concentrically : lunule in-
distinct : teeth, in the right valve three, and in the left valve
two cardinals, besides the usual lateral in each valve : pallia!
scar exhibiting a remarkably deep sinus.
To the learned authors of the '
British Mollusca 3 is
the credit due of proposing and establishing the present
genus, which connects the Venerida? with the Tellinidce,
and almost forms the type of an intermediate family.
In the structure and position of the siphonal tubes it is
more like Tellina than Venus ; and in the orbicular form
of the shell, as well as in the number and shape of the
teeth, it differs from any genus
* Having the aspect of the genus Lucina.
in either of the above-