sulcation. In them the anterior rlorsal area is not visihle de- 

 limiter! and the creniilation of the r:s.rr-ins is more feeble." 

 (Dall, 1905). 



'^\y'pe loealiti- .-. Ba7den, Jamaica . 



Rerrar>:s .- Tv/o valves of this snail form are present. It is 

 at once distinguished from the young of associated species hy 

 its prominent, lamellose consentric sctilptiire. 



OcQurrenco .- Lower Miocene : Bovrden hec^s, Bowden, Jamaica 

 (Dall, 1903). 



