i'LATK LXl— CoDllnaeU. 



Grammysia communis. 



Page :I7». 

 See Plate 93. 



Fig. 24. A right valve. 



Chemung group. Near HobbietjUle, N. 7. 

 Fig. 25. A left valve proportionally l)roa<ler than the jjreceding. 



Chemung group . Near HoWieville, N. T. 

 Fig. 26. A left valve of elongate form. 

 Fig. 37. A left valve of a smaller specimen. 



Chemung group. Cattarauffus Co., N. Y. 

 Fig. 28. A large left valve. 



Chemung group. Cattaraugun Co., N. Y. 



Grammysia IIannibalensis. 



I'llKe iWl. 

 Fig. 29. A right valve. 

 Fig. 30. The left side of a sjiecimen. 



Waverly gi-oup. Cuyahoga Co., Ohio. 

 Fig. 33. A right valve. 



Choteau limestone. Hannibal, Mo. 



Grammysia plena. 



.II'Hl 



. I'^go 3S2. 

 Fig. 31. A left valve. 



Yellow sandstone. Burlington, Iowa. 

 Fig. 32. A left valve of shorter form, showing the (characteristic plication on the post-<cttriliiiiil slope. 



Yellow sandstone. Burlington, Tinoa. 



