SOLEN. 7] 



double, diverging on each side the umbo ; these are thin, 

 but stand erect, considerably above the commissure ; a de- 

 pression, or furrow, on the margin, divides each tooth into 

 two lamina? almost to the beak, where they are united and 

 form an acute angle. One valve of this curious shell has 

 as yet only come under inspection ; we found it in sand 

 from Salcomb Bay : it was recent, and as clear and pellu- 

 cid as the Bulla aperia; being very flat, has the appear- 

 ance of a scale of a fish. Length three-eighths of an inch ; 

 breadth half an inch/' 



