HELICID.E. 141 



Shell three quarters of an inch in diameter, finely 

 granulated ; volutions five, the outer one sloping on 

 both sides so as to form a sharp edge in the middle of 

 the margin, which runs spirally round the upper volu- 

 tions and marks their separation by a fine line; um- 

 bilicus central, large, and deep ; aperture oval, with 

 an indenture or small notch on the inside at the outer 

 pointed extremity where the keel commences; the 

 peristome broad, thin, white, reflected, united and 

 detached all round. 



Linnaeus, from some fancy, called this shell Lapi- 

 cida or stone cutter. 



The shell is liable to some variations in size and 

 colour. It is rarely pale greenish, nearly transparent ; 

 it also varies in the distinctness of the brown mar- 

 bling. 



The young shells, as in most other Helices, are 

 much more depressed and more strongly keeled. 



Dr. Fleming (Brit. Anim.) thought that the Helix 

 cochlea of Brown (Wern. Trans, ii. t. 24. f. 10.) and 

 H. terebra Turtoii (Conch. Diet. 161. t. 14. f. 55.) 

 was probably a produced variety of this shell ! 



a. ZURAMA Leach MSS. 



Shell depressed, transparent, umbilicated ', mouth round; 

 peristome reflexed, continued ; epiphragm membrana- 

 ceous. 



27. 9. HELIX pulchella. White Snail. Shell opake- 



white or brownish, depressed, equally convex 



on both sides; aperture nearly circular, with 



the margin flat and reflected. 



Helix pulchella. Mutter, Verm. ; Drap. p. 112. t. 7. 



