66 



PROCEEDINGS OF THE ACADEMY OF 



[March, 



stage, which is long and well developed though accompanied by con- 

 siderable individual variation. The curved rib and cancellated stages 

 are very short. 



Fig. 5 — Volutilithes sayana Conrad. Claiborne, Ala. Apex enlarged, show- 

 ing ornamental features thrown far back by acceleration. The smooth stage 

 is almost entirely confined to the large first whorl. In whorl two the transition 

 from the straight untubercled ribs (suppressed curved rib stage) to the can- 

 cellated stage is seen. Whorl three shows the cancellated stage. Length = 

 1.8 mm. 



Fig. 6. — Volutilithes sayaria Conrad. Claiborne, Ala. Adult individual. 

 Length = 48 mm. 



Volutilithes sayana Conrad. 

 Locality — Claiborne, Ala. 



This species was originally described as Valuta sayana by Conrad. ^° 

 Whorl 1 — Smooth and rounded. 



Whorl 2 — Smooth and rounded at first, but soon ribbing begins. 

 Untubercled ribs are the first ribs, but they are not curved. Neverthe- 



1" Fossil Shells of the Tertiary Formations of North America. 



