PLATE YL 
Platyceras dtjmostjm, Comad. 
Page 14. 
Fig. 1. View of a large ventricose specimen imbedded in rock, showing the form of the aperture and the 
long submarginal spines in place. Schoharie, N. Y. 
Platyceras multispinosum, Meek. 
* Page 15. 
Figs. 2, 3. Ventral and lateral views of a specimen communicated by Dr. J. S. Newberry for comparison 
with P. dumosiim. 
