92 MYA. 



about February, and are sold at two shillings a dozen, 

 but are not much esteemed. The largest measure 

 about five inches in breadth, and two inches and a half 

 from hinge to margin. They are eaten in the neigh- 

 bourhood of Southampton, where the fishermen call 

 them old maids. 



CONVEX GAPER. 

 PL 18. /. 1. 



3. Mya convexa. M. testa ovata, convexa, fragili, antice oblique suban- 



gulata ; cardinis dente semiovali. 

 Shell oval, convex, brittle ; anterior end obliquely angulated ; tooth in 



the hinge semioval. 

 Donovan Brit. Shells, t. 82. (Mya declivis.) 



A very light brittle shell, remarkably convex, and 

 strongly angulated at the anterior end : the outside is 

 concentrically striated, and covered with an ochreous 

 coat, rather rough near the anterior edge ; when de- 

 prived of this coat, the shell is perfectly white. Inside 

 yellowish white; tooth small, oval, and projecting 

 horizontally. 



This species is certainly distinct from the following, 

 which is a much stronger and flatter shell. Its remark- 

 able convexity has induced the author to give it the 

 trivial name of convex gaper. Donovan has evidently- 

 figured this shell, under the name of M. declivis. It 

 is found on the coast of Devonshire. 



