140 PNEUMONOBRANCHIATA 



it does not appear to have been found in any other 

 locality. 



Helix holosericea of Studer, and H. diodonta of 

 Muhlfeld, found in various parts of the Continent, 

 chiefly differ in the distinctness of their teeth on the 

 lips. 



f. Chilotrema Leach. (Rock Snail.) 



Shell orbicular, depressed, perforated, equally convex on 

 both sides, sharply carinated in its outer circumference ; 

 aperture transverse, oval; the peristome united all 

 round, elevated from the other whorls, and margined ; 

 epiphragm membranaceous. 



26. 8. Helix lapicida. Variegated Rock Snail. 



(f. 51.) Shell umbilicate, finely granulate, grey 



or pale rufous with reddish rays or spots. 

 Helix lapicida. Linn. S.N.I. 1241. ; Mont. T. B. 



435.; Drap. p. 111. t. 7. f. 35—37.; Brard, p. 



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

 Carocolla lapicida. Lamarck, vi. ii. p. 99. ; Turt. 



Man. ed. 1. f. 51. 

 Latomus lapicida. Fitz. Prod. 97. 

 Helicogona lapicida. Ferus. Prod. 150. t. 66*, 



f.6. 

 Chilotrema lapicida. Leach, Mollusc, p. 106. 

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



List. Conch, t. 3. f. 4.; Pet. Gaz. t. 92. f. 11. 

 Var. 2. whitish. Pfeiffer, 2. f. 27. 

 In the fissures of limestone rocks, and in woods on 

 a chalky soil. 



Animal green or blackish green ; neck granular, 

 with two dark streaks ; hinder part of the foot yel - 

 lowish. (Sturm, t. 26.) 



