PLATE LXXXII. 
Aviculopecten .equilateralis. 
Page 19. 
Fig, 1, A left valve showing the form and surface ornamentation. 
Chemung group. Alleghany Springs, Warren Co., Pa. 
Lyriopecten anomleformis. 
Page 53. 
See Plates 4 and 10. 
Fig. 2. The specimen illustrated on plate 10, fig. 5, redrawn to show the proper form and surface orna¬ 
mentation. 
Chemung group. Chemung creek, N. Y. 
Lyriopecten orbicularis. 
Page 42. 
See Plate 4. 
Fig. 3. A specimen with the upper portion of the left valve removed, showing the exterior impression of 
the right valve and the comparative size of the two valves. 
Hamilton group. Canandaigua lake, N. Y. 
Pterinopecten suborbicularis. 
Page SO. 
See Plates 8 and 24. 
Fig. 4. A right valve of this species showing the deep byssal sinus. 
Chemung group. Mansfield, Pa. 
Lyriopecten interradiatus. 
Page 44. 
See Plate 2. 
Fig. 5. A large left valve showing the surface ornamentation and the ligamental area. 
Hamilton group. Schoharie Co., N. Y. 
Lyriopecten Priamus. 
Page 54. 
See Plate 10. 
Fig. 6. A right valve of this species. 
Chemung group. Franklin, Delaware Co., N. Y. 
Pterinopecten undosus. 
Page 72. 
See Plate 2. 
Fig. 7. A left valve with comparatively few radii, and the strong characteristic concentric undulations. 
Hamilton group. Bethany, N. Y. 
Pterinopecten reflexus. 
Page 58. 
Fig. 8. A view of the interior of a left valve. 
Corniferous limestone. Ohio falls. 
