40 Bulletin 14 306 



RAPHISTOMA Hall 



Raphistoma lenticulare Emmons, PI. 19, figs. 7, 8 



Shell discoidal, spire depressed, flattened; volutions about 

 four, body whorl wider than all the others. Suture deep in cast. 

 Umbilicus about one-third the width of under surface, extending 

 to top. Aperature subtrigonal, transversely extended; outer 

 edge obtuse. 



None of the specimens from this locality have the surface 

 markings preserved. 



Locality. — Top of the Black River and base of the Trenton. 

 C'25, 30, 39. Crown Point, N. Y. 



PTEROTHECA Salter. 



Pterotheca expansa Emmons, PI. 19, fig. 12 



This obscure fossil is figured here in hope that the attention of 

 other workers will be called to it. Its affinities seem to be rather 

 doubtfully understood. 



Locality. — Lower Trenton, Crown Point, N. Y. 



