60 CONCHY L\ A— DITHYRA. 20. 



ongitudlnal raised striae: beaks prominent, not quite central: 

 the teeth in one valve obscure. 



bidentata. MoNTAcuTA testd ovald Ifevi, denie altera ohliquo cochleari- 

 fortni. 

 Shell oval smooth, with one of the teeth oblique and spoon- 

 shaped. 

 Mya bidentata. Montagu, p. 44, tab. 26, fig. 5. 

 Limi. Trans, viii. p. 41. 

 Turton, British Fauna, p. 147. 

 Pennant, Brit. Zool. iv. p. 166. 

 Wood, Conch, p. 99. 

 Dillwyn, Descript. Catal. p. 45. 

 Turton, Conch. Diet. p. 102. 

 Mus. nost. Fine sand, and in the back of old oyster-shells; 



Shell hardly the eighth of an inch long, rather produced at one 

 end, whitish but not glossy, and frequently covered with a rough 

 coat : beaks near the broader end. 



feiruRinosa. MoNTACUTA testd oblongd, transversim suhstriatu, dente altero 

 incurvo cochleariformi. 

 Shell oblong, slightly striate transversely, with one of the teeth 



incurved and spoon-shaped. 

 Mya ferruginosa. Montagu, Suppl. p. 22, tab. 26, fig. 2. 

 Pennant, Brit. Zool. iv. p. 167. 

 * Wood, Conch, p. 100. 



Dillwyn, Descript. Catal. p. 46. 

 Turton, Conch. Diet. p. 102. 



