Fig-. 
Fig- 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Figs. 
Fig. 
Fig. 
Fig- 
Fig. 
PLATE LVIII. 
Grammysia elliptica. 
Page 365. 
1. A small left valve of unusually rotund form, referred to this species with some doubt. 
Lower Chemung group. Ithaca, N. Y. 
2. A left valve of the usual form and proportions. 
Chemung group Alleghany Co., IV. Y. 
3. A right valve similar to the preceding. 
Chemung group. Philipsburgh, IV. Y. 
4. A right valve. 
Lower Chemung- group. Ithaca, N. Y. 
5. A left valve similar in form to fig. 1, and also referred with doubt to this species. 
6. The opposite side of the preceding, showing the escutcheon and hinge. 
Chemung group. Philipsburgh, IV. Y. 
7. The left side of a specimen. 
Chemung group. Mansfield, Pa. 
8. 9. Two left valves of young individuals. 
Chemung- group. Philipsburgh, N. Y. 
10. A large right valve. 
Chemung group. Mansfield, Pa. 
11. The anterior portion of a large right valve of unusually erect form. 
Chemung- group. Mansfield, Pa. 
12. The hinge of a right valve showing the ligamental area and cardinal fold. 
Chemung group. Mansfield, Pa. 
Grammysia circularis. 
Page 361. 
See Plate 57. 
13. The left side of a large individual. The specimen was found in the town of Nichols, Tioga Co., 
N. V. Its precise horizon is unknown. 
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