104 



by lines of growth : it is tvrice as long as wide, and not 

 remarkably deep. The ligament is seated in a deep and 

 wide grooTe. 



Only two specimens of this curious shell, which forms 

 an esculent Genus, have fallen under our notice ; the one 

 a young individual presented by G. W. Braikenridge, 

 Esq. the other apparently full grown, purchased by 

 Mr. G. B. Sowerby ; they are both from Dundry, near 

 Bristol, and were imbedded in the Ironshot Oolite. 



