The young and even -the adult shells of this singular spe- 

 cies are often without the calcareous tunic; sometimes the 

 latter only exists partially, showing the costae around it ; and 

 again the costae are occasionally wanting, probably from age. 



OLIVA. 



1. O. Alabamensis. Pi. 17. fig. 1. 



Shell subfusiform, spire conical, acute, the whorls contract- 

 ed, and defined by an impressed line above the suture. Length 

 \\ inches. 



Locality, Clai borne, Alab. 



Cab. Acad. N. S. 



2. O. bombylis. PI. 18. fig. 5. 



Shell Slender, subcylindrical, acute ; aperture narrow ; su- 

 tural canal well defined; columella with about seven stride. 

 Length J of an inch. 



Locality, Clai borne, Alab. 



Cab. Acad. N. S. 



INFUNDIBULUM. 



/. urticosum. PI. 17. fig. 3. 



Shell convex, thin, suboonical, with three or four volutions 

 terminating in a subceutral apex : dorsum covered with short 

 tubular spires ; base with obscure diverging striae, umbilica- 

 ted. Diameter 1 inch. 

 Variety, B. Flattened or discoidal : smooth on the back. 



Variety, C. Elevated, smooth. 



I at first thought there might be two or three species among 

 these fossils, but a comparison of a great number of indi- 

 viduals has convinced me of their specific identity. 



Locality, Claiborne, Alab. 



Cab. Acad. N. S. 



PYftULA. 



P. penita. PI. 17. fig. 4. 

 Shell subfusiform, reticulated, with three carinations on the 



[64] 



