364 Dr. Turton on some new British Shells, 



the larger volution is always milk-white as well as the margin of 

 the aperture. It has six volutions, which are flatter than in either 

 of the two above mentioned ; and is remarkable in its genus for 

 the white tubercle seated near the upper and outer angle of the 

 aperture. 



Icon. tab. xiii. fig. 4. 



Mus. nost. Blomer. 



5. CllEPIDULA SINUOSA. 



Testa orbiculo-'Ovat&y Iceviy lade&y immaculata ; margine sinuato. 



Shell roundish oval, smooth, entirely milk-white; with the 

 margin sinuate. 



Length half an inch ; breadth four-tenths. 



Found at Scarborough, in Yorkshire, by Mr. Bean. The outer 

 surface is polished, and under a glass appears to be very finely 

 and irregularly striate transversely : but it has no ribs, nor 

 prickles, nor colourings of any kind. 



Icon. tab. xiii. fig. 5. 



Mus. nost. Bean.* 



6. Bulla alba. 



Testoi ovatd'Oblonga^ longitudinaliter striolat&y alba^ immacuf 

 lat&i vertice umbilicato ; extremitatibus striis transversis 

 tribus punctatis. 



Shell oval-oblong, slightly striate longitudinally, entirely white ; 

 crown umbilicate : at each extremity three transverse punctured 

 strias. 

 . Jjcngth breadth 



We dredged up half a dozen of these shells in the British 

 Channel, all dead. They are more elongated than the Bulla 

 Ampulla^ and essentially differ in having only three rather remote 

 transverse striae at each end, whereas on the latter shell there are 



♦ We cannot agree with Dr. Turton in placing this Crepidula on the British 

 List, as Mr. Bean informed us that he took it from the bottom of a ship just 

 arrived from North hmQUCA,— Editors* 



