7§ 



SHELLS. Class VI. 



I have alfo found them in mafTes of foflil wood, 

 in the fhores of Abergelli in Denbigh/hire. The 

 bottom of the cells are round, and appear as if 

 nicely turned with fome inftrument. 



Tab, xl. fig. 13. 



Div. II. Bivalve Shell?. 



MTA. 



GAPER. 



IV. Its animal an Ascidia. 



A bivalve fhell gaping at one end. 

 The hinge, for the mod part, furnifhed 

 with a thick, flrong, and broad tooth, 

 not inferted into the oppofite valve. 



Truncata. M. Truncata. Lin. Syfi. it 12. Faun. Suec. No. 21264 

 14. Abrupt. Lift. AngU tab. v. fig. 36. 



M. TT 7ITH a broad, upright, blunt tooth, in 

 V V one fhell \ the clofed end rounded ; 

 the open end truncated, and gaping greatly ; 

 the outfide yellow, marked with concentric 

 wrinkles. Tab. xli. fig. 14. 



Lodged under flutchy ground, near low-water 

 mark ; difcovered by an aperture in the flutch, 

 beneath which it is found in coarfe gravel. 



M. with 



