67 



Shell three quarters of an inch in diameter, finely 

 granulated: volutions five, the outer one sloping 

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

 middle of the margin which runs spirally round 

 the upper volutions and marks their separation by 

 a fine line : umbilicus 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 peritreme broad, thin, 

 white, reflected, united and detached all round. 



In the fissures of limestone rocks, and in woods. 



F 2 



