322 HELIX, SNJIL. Class VI. 



y. ALBA. Gm. Lin. 3625. Moni.TesL Br.45Q.id. Sup, 



Lin. Tr. viii. I92. t. 25. /. 7- ' '- 



* He. an umbilicated shell, both sides striated, 

 with a wide aperture ; diameter a quarter of an 

 inch ; found in rivers and ditches. 



lU. rONTA- Lin. Tr. viii. \Q3. . . ^ Mont. Test. Br. 462. t. Q. 



NA. " /. 6. id. Sup. 146. 



* He. with a flattish shell, bluntly carinated, 

 on one side umbilicated, having three volutions, 

 convex on both sides ; aperture half ovate ; 

 diameter scarcely two tenths of an inch ; inha- 

 bits fresh water. 



n. PALU- Lin. Tr. viii. I93. Mont. Test. Br. 440. 



DOSA. 



* He. with an umbilicated shell, rather convex 

 above; aperture nearly orbicular, margined, 

 the margin reflected. 



VAR. B. 



Helix crenella. Mont. Test. Br. 441. 



He. with striated or annulated volutions. 

 Found in lakes and banks of rivers. 



