PLATE VI. 
Aviculopecten pkinceps. 
Page 1. 
See Plates 1, 5, 24 and 81. 
Pig. 1. A large left valve, much extended posteriorly. 
Hamilton group. Seneca lake, N. Y. 
Fig. 2. The impression of the exterior.of a large right valve, showing the ligamental area. The spot near 
the middle of the valve has been caused by the attachment of a Crania to the exterior of the 
shell. Hamilton group. Hamilton, N. Y. 
Fig. 3. An impression of the interior of a right valve. The striated ligamental area is shown in the 
specimen, but not represented in the figure. 
Hamilton group. Hamilton, Madison Co., N. Y. 
Fig. 4. An imperfect left valve. 
Fig. 5. The right valve attached to the preceding, showing the comparative size and ornamentation. 
Fig. 6. A small oblique left valve. The hinge-line should be represented as straight, and with a strong 
ligamental area. 
Fig. 7. A specimen preserving both valves. 
Hamilton group. Borodino, N. Y. 
Fig. 8. A left valve, showing the ordinary characters of the species. The ligamental area is preserved 
in the specimen, but not here represented, and the hinge-line is too short in the figure. This 
valve is associated with, and probably belonged to the right valve shown in figure 3. 
Hamilton group. Hamilton, N. Y. 
Fig. 9. An imperfect left valve. 
Hamilton group. Skaneateles lake, N. Y. 
