PLATE III—Continued. 
Aviculopecten ensignis. 
Page 34. 
See Plates 1 and 81. 
Fig. 13. The interior of a right valve imbedded in shale, showing the ornamentation as it appears on the 
interior of the shell. 
Hamilton group. Hamburg, Erie Co., N. Y. 
Aviculopecten ornatus. 
Page 37. 
See Plate 2. 
Fig. 14. The interior of a left valve imbedded in shale, X 2. 
Hamilton group. Canandaigua lake, N. Y. 
Aviculopecten mucronatus. 
Page 38. 
Fig. 15. The interior of a left valve imbedded in shale. 
Hamilton group. Dresden, Yates Co,, N. Y. 
Aviculopecten lautus. 
Page 14. 
See Plate 81. 
Fig. 16. The interior of two attached valves imbedded in shale, showing their comparative form and pro¬ 
portions. 
Hamilton group. West Bloomfield, N. Y. 
Fig. 17. The interior of a left valve preserved as the preceding. Another figure of this specimen is given 
on plate 81, fig. 5, taken from an impression of this mould. 
Hamilton group. York Centre, Livingston Co., N. F. 
Aviculopecten exacutus. 
Page 8. 
Fig-. 18.. The interior of a left valve imbedded in shale.., . i 
Hamilton group. Hamburg, Ei'ie Co., 2V. Y. 
Fig. 19. A small left valve with the anterior ear imperfect. 
Hamilton group. Canandaigua lake, N. Y. 
Fig. 20. A large imperfect left valve. The beak is represented as too acute, and the concentric lamellse 
are not shown as on the specimen. 
Hamilton group. Hamburg, Erie Co., N. Y. 
Fig. 21. A left valve denuded of the test. The specimen shows the pallial line and muscular impression, 
as described in the text. 
Fig. 22. The upper portion of a right valve preserving the test. 
Hamilton group. Hamburg, Erie Co., N. Y. 
