110 THE ELEMENTS 



pillar-lip reflected : sub-umbilicated. 

 Found in the Thames and New River. 



Linn. Trans, vol. viii. page 205. 



A Apex, H base, L a whorl, rr 

 bands or fasci. 



Fig. 9th -HELIX POLITA. Shell 

 strong, white, glossy and smooth, with 

 from nine to twelve volutions, scarcely 

 defined by a separating line, slender 

 and gradually tapering to a point; 

 aperture oval, outer lip thick, but not 

 marginated, inner or pillar-lip repli- 

 cated. Found in Devonshire, Dor- 

 setshire, Northumberland, and at 

 Dunbar in Scotland. 



Linn. Trans, vol. viii. page 210. 



A Apex, Z?base, 1212suture of the 

 spire or whorls, C aperture. 



Fig. 10th— BUCCINUM UNDA- 

 TUM. Shell with from seven to 

 eight ventricose volutions, with un- 

 dulated ribs; transversely striated, and 

 crossed with five longitudinal striae ; 

 pillar-lip reflected, and glabrous. 



