19 
MYA depressa. 
TAB. CCCCXVI1I. 
Spec. Char. Obovate, depressed, very slightly 
gaping, anterior-side shortest; beaks pro- 
minent incurved ; hinge line straight, de- 
pressed ; ligament external, short. 
Shell thin, slightly undulated by numerous lines of 
growth ; it has much the aspect of a Tellina, but 
although it has a bend in the front, it has not the sharp 
curve that characterizes Tellina. Many specimens have 
an external ligament preserved. 
Figured from a specimen in Miss Benett’s Cabinet 
from Weymouth. Miss Benett has also found it near 
Osmjngton, filled with indurated Clay that has by de- 
composition acquired a rust colour ; Mr. Wier has met 
with it in the C lunch Clay, near Ilorncastle in Lin- 
colnshire, and I have specimens very much crushed in 
similar Clay, from Shotover Hill, near Oxford, where 
it is accompanied with Trigonia clavellata, tab. 87 : this 
Trigonia, besides some very remarkable varieties of 
T. costata, 85, has also been collected by Miss Benett 
near Weymouth, and helps to shew the similarity of the 
strata at the above-mentioned places. 
MYA gibbosa. 
TAB. CCCCX1X.~^%. i. 
Spec. Char. Obovate, transversely furrowed, 
gibbose ; beaks prominent, incurved ; pos- 
terior side very short ; anterior side rather 
attenuated, gaping. 
This differs from the last chiefly in its thickness and 
the narrow formed anterior side ; it is nearly twice as 
thick in proportion as the Mya depressa. 
We are indebted to the kindness of Miss Benett for 
specimens of this shell ; they were picked up near 
Osmington with the rust-colored specimens above men- 
tioned, in 1814. 
