PLATE LVII. 
Grammysia alveata. 
Page 370. 
See Plate 60. 
Fig-. 1. Cardinal view of a specimen vertically compressed. 
Hamilton group. Chenango Co., N. Y. 
Fig. 2. The ventral view of a specimen vertically compressed. 
Hamilton group. Madison Co., iV. Y. 
Grammysia circularis. 
Page 361. 
See Plate 58. 
Two valves in conjunction which have been partially denuded of the shell, showing- muscular scars 
and pallial line. 
The right side of a cast of the interior showing muscular scars and pallial line. 
Anterior view of the same specimen. 
Hamilton group. Schoharie Co., N. Y. 
Anterior view of a specimen somewhat vertically compressed. 
Chemung group. Ithaca, N. Y. 
Grammysia nodocostata. 
Page 360. 
See Plates 55, 56, 96. 
Figs. 7, 8. Cardinal view and right side of a large individual. 
Hamilton group. Madison Co., N. Y. 
Grammysia magna. 
Page 362. 
See Plate 56. 
Fig. 9. View of a crushed specimen, showing the escutcheon and ligamental area with a portion of the 
ligament. 
Hamilton group. Pompey, Onondaga Co., N. Y. 
Grammysia erecta. 
Page 363. 
See Plate 56. 
Fig. 10. The umbonal and anterior portion of a right valve. 
Hamilton group. Near Bear's gulf, Schoharie Co., N. Y. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
