PLATE LXI. 



Mactra solida ; strong. Penn. Br. Zool. No. 43. tab. 51. fig. 43. 



A. et tab. 52. fig. 43. — Chemnitz. Conch. 6. t, 



23./. 229. 230. 

 Trieonella crassa transversim fasciata. Zonaria. Da Costa. Br. 



Conch, tab. 15. fig. 1. 1. 



This species is found on many of our shores, as Kent, Dorsetshire, 

 Lancashire, Yorkshire, Northumberland, the coast of Wales, &c. 



The girdles are most prominent in the dead shells ; the surface be- 

 tween them appearing much worn. 



