35 



on the apex nearly smooth; aperture about one third of the 

 length of the shell : right lip striated within. Length f of an 

 inch. 



Locality, Claiborne, Alab. 



Cab. Acad. N. S. 



CANCELLARIA. 



C. gemmata. PI. 18. fig. 6. 



Shell conical, acute, scalariform, with longitudinal costee; 

 transverse lines .not very distinct; shoulder acute; coluraella 

 three toothed : labrum internally with about nine raised lines ; 

 umbilicus open : aperture triangular. Length f of an inch. 



Locality, Claiborne, Alab; 



Cab. Acad. N. S. 



> LITTORINA. 



L.antiquata. PI. 18. fig. 7. 



Shell conic-acute, somewhat ventricose, with numerous re- 

 volving, very elevated lines, alternating with smaller ones, 

 and longitudinal, approximate, regular striae ; sutures deeply 

 impressed ; whorls convex ; umbilicus distinct, rounded ; mouth 

 orbicular, slightly contracted by the rotundity of the penulti- 

 mate whorl. Length an inch. 



Locality, Claiborne, Alab. 



Cab. Acad. N. S. 



MELANIA. 



M? vetusta. PI. 18. fig. 8. 



Shell turrited, acute, with numerous revolving, slightly ele- 

 vated lines, alternately larger and smaller, and longitudinal 

 minute, much arcuated wrinkles : suture obvious, not deeply 

 impressed : canal patulous ; aperture about one-fouYth of the 

 length. Length li inches. 



This seemingly fresh water shell occurs with the marine tes- 

 tacea in the arenaceous strata near Claiborne, Alab. 



Cab. Acad. N. 3. 



[67] 



