AMNICOLA FOR AT A. 13 



OBSERVATIONS. 



Intermediate between lustrica and porata. It 

 is not as short and transverse as the former, 

 which, moreover, is widely umbilicate and has 

 the aperture regularly rounded posteriorly. Ac- 

 cording to the description of Professor Adams, 

 the labium sometimes scarcely touches the body 

 of the shell. The spire is comparatively longer 

 than in porata, the outline less transverse, and 

 the aperture not orbicular. 



AMNICOLA PORATA, Say. 



PLATE 1. FIG. 8. 



A. test lata, curta, late umbilicata; anfractibus 4$ cylin- 

 draceis, lineis obsoletis eleVatis revolventibus; aperturk 

 rotundatiL Long. 5^ mm. 



SYNONYMS AND REFERENCES. 

 P. PORATA, SAY. Journal Acad. Nat. Sci., vol. ii. p. 174. 



DESCRIPTION. 



SHELL "obtusely conic or subglobose; volu- 



