EXPLANATION OF PLATE IIL 



Figure 7. Ampullaria angulata, Nobis. 



A, testfi suborbiculata, perCoratri, supernc planiilati, hepatica ; 

 spiiii elevata. ; anfractibusad suturas latis angulatis. 



Hab. Mexico. 



This curious river shell will easily be distinguished by 

 the angularity of the superior parts of the whorls. 



Figuie 8. Ampullaria ochracea, Nobis. 



A. testa ventricoso-globosti, tenui, Isevi, ochracea; anfractibus 

 convexis et ad suturas albo-cterulescentibus. 



Hab. Spanish Maine. 



Figure 9.9. Helix speciosa, Nobis. 



H. testa subglobosa, imperforata, spadicea ; anfractibus fas- 

 oils albis transversis. 



Hab. ? 



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