PLATE 117. 



Pngo 

 Fig. 1 - 10. Pl-ATYCKRAS OEBHARDI. 474 



I a, b. A young sliell, 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. 

 6 o, ft. A specimen in which the peristome is free and not expanded. 

 6 o, 6. 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 c, ft. 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. 



