PLATE VI. 
I )eltop(‘eteu leniuseuliis, Dana, sp. 
Fig. 1. Oicatly cxft)liatt‘d left valve, indicating a considerable thickness of test. 
I >eltopecten farleyensis, Eth.fih and Dun. 
Fig. 2. Compressed testiferoiis right valve, showing very numerous linear costa’ and wide 
latilamiiiie, both on the body of the valve and the auricles. 
Localities. 
F''ig. 1. Mt. Vincent. 
Fig. 2. New England — probably near Drake. 
