PLATE XCII. 



Mya tronctata, abrupt. Penn. Br. Zoo!. 4, 14. tab. 4!. fig. !4„ 

 Charaa subrotmida fusca rugosa, exaltera parte trunctata. Tr.unc~ 

 tata. v Da Costa. Br. CorcJu p. 233* jp. 57. 



Common on many of the British shores. 



