I84 NEW YORK STATE MUSEUM 



Platyceras lejeunii nov. 



Shell of medium size with relatively small coil and rapidly ex- 

 panding suberect body whorl. Surface with subspiral or some- 

 what twisted longitudinal ridges crossing and festooning irregular 



Platyceras lejeunii 



concentric growth lines. The surface is covered with very long 

 and slender spines which are curved or arched backward. The 

 shell is more slender than other echinate species and the spines 

 relatively longer and more arched. 

 Lower Devonic. Grande Greve, P. O. 



Platyceras (Orthonychia) belli nov. 



Shell erect, minutely arched and incurved at the apex, expand- 

 ing very gradually but equally for nearly one half its length and 

 thence more abruptly, the cross-section of the whorls being es- 



Platyceras (Orthonychia) belli 



sentially circular and the stomal margin undulated. Surface 

 crossed transversely by rugose concentric growth lines, their un- 

 dulations corresponding to low grooves and folds of the shell. 

 Length of a full-sized specimen 50 mm ; stomal width 33 mm. 

 Lower Devonic. Grande Greve, P. Q. 



