t^^l

PAEBETSIA. 173
posteriorly ; anterior side gently rounded ; posterior side slightly
and very bluntly produced, rounded; cardinal teeth very anteriorly
situate, with upper surface multi-ridged and supported in each
valve by an enormous column-like callous thickening of the shell;
lateral teeth coarse, rather short, curved ; anterior muscular scars
of great depth ; posterior scars subcircular, well impressed;
interior of shell very pale greenish white.
Long. 37, lat. 55, diam. 33 mm.
Hob. jSfongyaug Lake, south of Patkai.
The type is in the Indian Museum.
308. Parreysia (Parreysia) annandalei, Preston.
Parreysia (Parreysia) annandalei, I'reston, Rec. Ind. Mus., Calcutta,
vii, 1912, p. 302.
Onginal description :—Shell oval, convex, moderately solid,
coarsely concentrically ribbed, covered with a thin, smooth,
brownish-olivaceous periostracum; umbones rather small, not
Fig. 18.—1 & 2. Parreysia (P.) annandalei, Preston. (Type.) Nat. size.
3. Hinge of same.
.prominent; dorsal margin arched; ventral margin considerably
rounded; anterior side slightly produced and rather sharply
rounded : posterior side very bluntly subrostrate; cardinal teeth
tvAo in each valve, somewhat anteriorly situate, rather coarse and
corrugated; lateral teeth strong, curved ; anterior scars rather