19 



MYA depressa. 



TAB. CCCCXVIII. 



Spec. Char. Obovate, depressed, very slightly 

 gaping, anterior side shortest; beaks pro- 

 minent incurved ; hinge line straight, de- 

 pressed ; ligament external, short. 



J^HELL thin, shghtly 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 TelHna. 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 

 Osmington, filled with indurated Clay that has by de- 

 composition acquired a rust colour : Mr. Wier has met 

 with it in the Clunch Clay, near Horncastle 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. CCCCXIX.— /^^. 1. 



Spec. Char. Obovate, transversely furrowed, 

 gibbose ; beaks prominent, incurved ; pos- 

 terior side very short ; anterior side rather 

 attenuated, gaping. 



X HIS 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. 



