PLATE LXI—Continued. 
Fig. 
Fig- 
Fig- 
Fig- 
Fig- 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
GtRAMMYSTA communis. 
Page 378. 
See Plate 93. 
24. A right valve. 
Chemung’ group. Near Hobbieville, N. Y. 
25. A left valve proportionally broader than the preceding. 
Chemung group. Near Hobbieville, N. Y. 
26. A left valve of elongate form. 
27. A left valve of a smaller specimen. 
Chemung group. Cattaraugus Co., N. Y. 
28. A large left valve. 
Chemung group. Cattaraugus Co., N. Y. 
GtRAMMYSTA HaNNTB ALENSIS. 
PiIqC 1. 
29. A right valve. 
30. The left side of a specimen. 
Waverly group. Cuyahoga Co., Ohio. 
33. A right valve. 
Choteau limestone. Hannibal, Mo. 
Grammysta plena. 
Page 382. 
31. A left valve. 
Yellow sandstone. Burlington, Iowa. 
32. A left valve of shorter form, showing the characteristic plication on the post-cardinal slope. 
Yellow sandstone. Burlington, Iowa. 
