72 
Bulletin 35 
220 
Paf;e SS 
gradually increasing from the smaller end, which is annulate, 
becoming smooth towards the middle of the shell ; the 
lower half smooth, shining, rather suddenl}" thickened near 
the aperture, to form which it as suddenly contracts to a 
diameter not greater than that of the smaller third of the 
tube. 
There are no very distinct characters by which to separate 
this annelid case from D. planum of the European Eocene. 
I have thought it as well nevertheless to indicate its 
pre.sence in the Jamaica tertiaries under a provisional name. 
