PLATE XXIV. 



Pterinopecten imbecihs. 



Paf^e 75. 

 Fig-. 1 . An imperfect left vahe, X 2. 



Chemung group. T'lorja, T'loya Co.. Pa. 



Ptekinopectex (Aviculopecten) strictus. 



Page 74. 



See Plate 82. . 

 Fig. 2. A right ^•alve showing the form of the shell and the characters of the hinge. 

 Chemung group. Near EVmlra, N. I. 



AVICULOPECTEN PLENUS. 



Page 21. 

 Fig. 3. A left valve, showing the genei-al features of the shell. 

 Chemung group. Near Elmira, N. Y. 



AviCULOPECTEN IdAS. 

 Page 13. 



See Plate 3. 

 Fig. 4. A right valve. 



Hamilton group. Cayuga lake, N. Y. 



Lyriopecten SOLUX. 



Page 56. 

 Fig. r.. A right valve, imperfect anterior to the beak. The recent discovery of the impression of this valve 

 substantiates the correctness of the restoration of the anterior ear in the figure. 

 Chemung group. Panama, N. Y. 



'.■,i:! !■! 



