CONCHYLIA— D/THYi?^. 27. 99 



Shell transverse or somewhat orbicular, flattish, inequilateral, with 

 a flexuous plait at the anterior side. Hinge with two teeth in 

 one or both of the valves ; and lateral ones which are generally 

 remote. Ligament external, on the shorter side. 



Like the Donax and the Capsa, this genus has the ligament 

 placed on the shorter side of the shell ; a circumstance, however, by 

 no means peculiar, as the same may be observed in the Amphidesma 

 Boysii and some of the Anatina tribe. But the general flatness of 

 the shell, with the flexuosity more or less observeable on thfe shorter 

 or cartilage side, and the disposition of the teeth, will at all times 

 present sufficient marks of character. 



The teeth are variable in number and position, and atford much 

 assistance in specific distinction. 



* Valvd altera bidentat, ovatce. 1-7- 

 With two teeth in one valve, and the shell oval. 



Tellina testa ovatd, strils transversis crebris, valvd altera bidentatd lineata, 



cum lateralibus, altera unidentatd muticd. ' — " 



Shell oval, with crowded transverse striae, one valve two-toothed 

 with a lateral one each side, the other valve with a single tooth 

 and no lateral ones. 



Tab nost. 7, fig. 1. 

 Turton, Conch. Diet. p. 168, fig 16. 

 Mus. nost. Dredged in Teignmouth bay . 



Shell five eights of an inch long, and seven eights broad, 

 thin, semitransparent, white with a pale red longitudinal "stripe 



o2 



