760 



NORTH AMERICAN INDEX FOSSILS. 



angle, which is regularly nodulated. Two strong non-nodose 

 spirals produce a marked biangulation of the body whorl ; inner 

 lip with three plications in the (posterior) upper part. 

 Chickasawan (Lignitic) of Alabama. 



Family Dolihle Adams. 



CXLV. Pyrula Lamarck. 



Thin, low-spired shells with strongly embracing whorls, drawn 

 cut anteriorly into a canal; aperture indented with sharp outer 

 lip; surface spirally sculptured. Comanchic-Recent. 



514. P. (Ficus) penita Conrad. (Fig. 1108.) Eocenic. 

 Spire conical; sutures scarcely impressed; body whorl round 



except for three faint carinse; surface cancellated by spirals and 

 vertical strise; lip thickened towards the margin. 

 Claibornian of Alabama, Nanjemoy of Maryland. 



515. P. mississippiensis Conrad. Oligocenic. 

 Thin, pyriform, with short spire and convex whorls; the body 



whorl flattened on top ; surface latticed by large distant spirals and 

 finer ones between, and closely arranged, vertical lines. 

 Vicksburgian of Mississippi. 



516. P. harrisi Martin. (Fig. 1107, b.) Miocenic. 



Fig. 1 107. a, Erato perexigua ; b, Pyrula harrisi ; c, Columbella communis. 

 (After Martin, Md. Mioc. ) 



Inflated with rather short canal, large aperture, and short spire ; 

 surface sculptured by fine spiral lines. 

 Chesapeake Miocene of Maryland. 



