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. 



h\ 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 Lajncidu. 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. 111. t.7./. 35—37. 



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



Chilotrema Lapicida. Leach, Mollusc, p. 106. 

 Helix acuta. Da Costa, p. 55. t. 4<.f. 9. 



