174 
I found this abundantly at Plumsted, near Woolwich in 
Kent, in 1808, yet very rarely a moderate specimen, and 
seldomer in pairs; they are placed in a stratum of shelly 
earthy matter seldom more than a foot thick, betwixt sand 
and flint pebbles, varying very much in size, and stratified 
above and below them. The shells are more or less stained» 
a little chalky, partly retaining their polish within, and 
separating easily from the earthy substance about them. 
MYA subangulata, 
TAB. LXXVI.—Fig. 3. 
Spec. Cuar. Rather depressed, smooth, wider than 
long, nearly equilateral, oblong-ovate ; anterior 
side angular above, acuminated ; front slightly 
emarginate, . 
Tue greater width in proportion to the length; the 
straighter and slightly indented front, and angular appear- 
ance of the anterior side, distinguish this shell from the last. 
From Barton, by favour of Miss Tylee. I believe it is 
very rarely found, yet the specimens are tolerably perfect, 
being cleaner and whiter than the last, and retaining the 
inside polish. I suspect this species gapes but little or not at 
all, yet the hinge does not allow of its being separated from 
the Mya, else the general construction might warrant it, 
as in external character it differs from fig. 1, which is the 
more common appearance of Mya. 
