CONCHOLOGIA CESTRICA. 



45 



shell is more depressed; the whorls are smaller; the 

 aperture is wider, and less round ; and the angle of 



V. minutft. [Morse.] V. pulchella. [Morse.] 



Fig, 69. 



r 



aperture, is 27; while in V. pulchella it is 35. They 

 also differ in the dentition of the lingual membrane ; 

 and the periostraca. Both species agree in presenting 

 varieties which are strongly, and transversely, costate. 



Sub-genus PATULA, HELDWIG, 1837. 



Shell umbilicate, turbinate, or depressed-discoid ; ru- 

 gose or costate-striate ; whorls 4-5, sub-equal; aperture 

 lunate-rotundate ; peristome simple, acute, straight. 



P. striatella, ANTHONY. 



Helix striatella, Anthony, Bost. Jour. Nat. Hist, III., 

 1840. 



JP. striatella. [B. & B.] 



Fig. 71. 



Jaw of P. striatella. [Morse. \ 

 Fig. 72, 



Shell depressed-convex, reddish horn color, or brown ; 



