t^^l

PSBimODOIJ'. 151
less distinct and placed a little more posteriori}^; nacre light
salmon, iridescent.
Long. 32, lat. 53, diam. 13 mm.
Hah. Pegu.
Comparing the present variety with what must be considered
the typical form of P. peguensis, the author makes the following
observations :—" .... uniformly more depressed, lighter coloured;
more regularly rhombic in form, and of less size; but the most
Pig. 9.—1 & 2. PsendodoH (T.)peguensis (Ant."l T»r. curvaia, Preston.
(Type.) Nat. aiet}.
3. Hinge and muscular scars of same.
prominent difierence consists in the beautiful erenulose striae of
the present species, which are densely crowded over the whole
surface of the shell, while M. [P.'] peguensis is remarkably smooth
over all except the posterior slope, and there the rugose folds are
broader and less numerous than in M. [P.] crebristriata; the lines
of growth are also more numerous in M. [P.] peguensis, generally
about 8, while crebristriata has rarely more than 3.