CONCHYLIA~l>ir£ir/i^. 9. 



36 



Lyonsia. 



Mya striata. 



Mya pellucida. 

 Mya Norwegica. 



Tab. nost. 3, fig. 6 and 7. 

 Montagu, Linn. Traht^ xi. p. 188, tab. 18, 



fig. I, A. 

 Titrton, Conch. Diet. p. 105, fig. 99. 

 Brown. Wern. Soc. ii. p.^05, tab. 24, fig. 1. 

 Gmelin, Syst. p. 3222. i 2 .:. 

 Turton, Linn. Syst. iv. p. 178. 

 Chemnitx, x. p. 345, tab. 170, f. 1647, 1648. 

 Wood, Conch, p. 98, tab. 18, fig. 4 and 5. 

 Dillwyn, Descript. Catal. p. 48. 

 Turton, Concli. Diet. p. 100, fig. 100. 

 Mm. nost. Tenby, Ireland, and the western coasts. 



Shell more than half an inch long, and an inch broad, oblong, 

 running in a nearly straight direction from the beaks to the an- 

 terior «nd, and prominently rounded at the opposite margin, thin, 

 semitransparent, covered with a pale brown skin, which is wrinkled 

 and very rugged at the anterior end, where it is truncate open and 

 reflected ; the valves finely and elosely striate longitudinally : 

 beaks near the rounded end, sometimes decorticated; inside 

 perlaceous with a rich nietailie lustre. 



The decortication about the hinge seems not to be a fixed, blit 

 rather an accidental character : for Chemnitz has observed that 

 they are generally so : natibus plerumque decOrticatis. 



striata. 

 1. 



'-^■> , v^ 



F 2 



