OF THE UNITED STATES. 47 



2. Mr. Nuttall found a cast at Cahawba, Alabama, 

 which seems to belong to this genus, yet has considerable 

 resemblance to Euomphalus. 



TURRITELLA. 



1. T. vertebroides, (S. G. M.) PL iii,fig. 13. 



Specific character. Turrited, subulate ; volutions about five, 

 rounded, with fine spiral striae, and about five elevated spiral 

 ribs on each whorl. 



Length, two inches. 



From New Jersey and Alabama. 



2. T. encrinoides. PI. iii, fig. 7. 



Of this fossil I have met with several fragments, yet 

 scarcely perfect enough for description. I have figured 

 one of them, to show the difference between this and the 

 former species, as the two occur in the same strata. 



Scalaria. 



S. Sillimani, (S. G. M.) PI. xiii, fig. 9. 



Specific character. Shell turrited ; volutions contiguous^ 

 rounded, with very prominent, reflected costae, and very mi- 

 nute spiral striae ; body whorl carinated near the base. 



Length, nearly one inch. 



From Prairie Bluff, Alabama. 



I dedicate this rare and beautiful species to my friend 

 Professor Silliman, of Yale College. 



1. S. annulata, (S. G. M.) PI. iii, fig. 10. 



Specific character. Volutions about five, convex and pro- 

 minent, with delicate transverse striae, which are decussated 

 by from twenty to thirty oblique, elevated, longitudinal ribs. 



Length, one inch and a quarter. 



