PLATE 117. 
Page 
Fig. 1 - 10- P Li AT Y C E R AS GEBHARDI. 474 
1 a, b. A young shell, in which the peristome is closely adhering to the body whorl. 
2. A similar specimen with the preceding. 
3 a, b. A larger individual of the same character. 
4. A specimen where the peristome is more expanded. 
5 a. b. A specimen in which the peristome is free and not expanded. 
0 a, b. A larger specimen, in which the peristome is expanded and free. 
7,8&9. Specimens in which the peristome is not expanded, or but slightly expanded and 
essentially free. 
10 a. b. Two views of a large specimen with a free peristome and small umbilicus. 
10 c. A specimen with expanded aperture, the peristome adjacent to the body volution, but 
still free. The umbilicus is much larger than in the preceding specimen. 
