anteriorly, v/ith finer sciil-ptitre, heavier right posterior cardi- 

 nal and more Aista.t laterals. Because of its relatively large 

 size, height atid strong posterior fle";inre it is readily disting- 

 uished from the associated Tellinas. 



Occurrence .- lower Miocene: Bov.den heds, 3owden, Jamaica 

 (Dall, 1900). 



