66 



IX. CAROCOLLA. 



Shell orbicular, depressed, equally convex on both 

 sides, sharply carinated in its outer circumference : 

 aperture transverse, oval ; the peritreme united 

 all round and margined : operculum none. 



The aperture, which is placed underneath, and is 

 quite perfect, not being interrupted by the con- 

 vexity of the penultimate volution, distinguishes 

 this from the Helix family. 



In winter the mouth is closed up by a fine pellicle 

 or film, near the centre of which is a minute 

 orifice or spiracle for the purpose of respiration. 



51. CAROCOLLA Lapicida. Shell umbilicate, finely 

 granulate, grey or pale rufous with reddish rays 

 or spots. 



Carocolla Lapicida. Lamarck, vi. ii. p. 99. 

 Helix Lapicida. Linn. Mont. 



Drap.p. lll.t. 7. f.. 35 37. 



Brard,p. 53. t. 2./. 14, 15. 



Chilotrema Lapicida. Leach, Mollusc, p. 106. 

 Helix acuta. Da Costa, p. 55. t. 4./. 9. 



