98 MIA. 



NORWAY GAPER. 

 PL 18. /. 4, 5. Mr. Sowerby. 



13. Mya Norwegica. M. testa ovali, longitudinaliter dense striata, 

 altero fine roiundata, altero truncata, natibus decorticatis. Linn. 

 Gmel. p. 3222. 



Shell oval, closely striated longitudinally; one end rounded, the other 



truncated. 

 Chemn. Conch. 10. pi. 170. f. 1647, 1648. 



In the shell represented in pi. 18. the coat is wanting, 

 and therefore the longitudinal striae are not so visible 

 as in the figure by Chemnitz. The inside of the shell 

 is pearly, and there is a triangular piece like enamel in 

 the cavity of the hinge, which does not appear, like a 

 tooth, to be permanent. The shell is near an inch long, 

 and an inch and three quarters broad. It inhabits 

 Norway. 



MEMBRANOUS GAPER. 



14. Mya membranacea. M. testa ovata, membranacea, Candida ; margine 

 ad proboscidem protracto,reflexo. Linn. Gmel. p. 3222. Mull.Zool. 

 Dan. Prodr. 2964. 



Shell oval membranaceous, and white ; margin, at the beak, prolonged 



and reflex. 

 Olaff. Isl. Res. 901. t. 11. f. 10. 



This is an oval shell, about the size of a bean, with a 

 plain hinge without any appearance of teeth. It in- 

 habits the coast of Iceland. 



DEFORMED GAPER. 



15. Mya distorta. M. testa subovali, valvulis difformibus, tumidio- 

 ribus ; cardinis dente crasso. Linn. Trans. 8. p. 37. 



Shell suboval, valves tumid and deformed ; hinge with a thick tooth. 

 Mont. Test. Brit. p. 42. t. 1. f. 1. 



A thin, brittle, white shell, with convex valves of a 



