UNIVALVES — HELIX. 163 



aquatic plants, others are found on trees and shrubs, 

 and some harbour in decayed wood. 



The term IXi^ (Helix) as applied to this genus, is 

 exti*emely indefinite, it refers only to the spiral form of 

 the shell, and might with equal propriety be applied 

 to any of the other turbinated genera. 



Division 1. — Shell with a carinated margin on the body-whorl. 



Family 1. — Umbilicated and depressed. 



Scientific Name. Locality. Common. Name. 



Lapicida <■ Europe Rock Siiail ••• 



Marginata Jamaica • • • • Margined • do • • 



Cicatricosa S. Seas, China, Jamaica • Reversed* • do •• 



Albella Europe, North America • Whitish • • do • • 



Albina Minute-white do 



Rotundata England,Denuiark,France Small radiated do 



Laevipes « • Guinea, Tranquebar Re verse- whorl'd 



Exilis Tranquebar White-striped do 



Cantiana Britain, (particularly Kent) Kent do • 



Rufescens England, Saxony Reddish • • do • 



Crenulata "••»• England, France Biack-tipp'ddo • 



Annulata Ringed • • • do • 



Fontana England Fresh-water do • 



Turcica Mogadore, Morocco • • • • Turkish • • • do • 



Family 2. — Umbilicated and convex. 



Cornu New Zealand Large horn do • 



Oculus-capri • • • • Asia, Pulo^Condore Goal's eye • do • 



Involvulus White-reflected 



Striatula Algiers Striated • ■ do 



Algira Africa,Amboyna, Jamaica Yellowish- do • 



Lcucas Africa Purple-lined do - 



Trochoides East Indies Angular-mouth do 



Incarnata ....... Denmark, Germany • • • • Flesh-colo?'d do. • 



M2 



