PLATE LXXXII. 



AVICULOPEGTEN ^QUILATERALIS. 



Page 19. 

 Fig 1. A left valve showing tiie fo:-m and surface ornamentation. 



Chemung gi-oup. Alleghany Springs, Watren Co., Pa. 



Lyriopecten anomi^formis. 



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. , ', , 

 Chemimg 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. 



Pterinopeoten suborbicularis. 



Page SO. 

 See Plates 8 and 24. 

 Fig. 4. A right val\-e of this species showing the deep byssal sinus. 

 Chemung gi-oup. Mansfield, Pa. 



Lyriopecten interradiatus. 



P.-ige 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 \'alve of this species. 



Chemung group. Franklin, Delavmre Co., N. Y. 



Pterinopeoten undosus. 



Page 72. 

 See Plate 2. 

 Fig. 7. A left valve with comparatively few radii, and the strong characteristic concenti-ic undulations. 

 Hamilton gi-oup. Bethany, N. Y. 



Pterinopeoten keelexus. 



Page 58. 

 Fig. 8. A view of the interior of a left valve. 



Corniferous limestone. Ohio falls. 



