I'l.ATK tJilll— Contiimea. 



EUTHYDKSMA SUIJTKXTILE. 



Pago 3t». 



See Plato 93. 



Vigs. 11-13. Left valves of this speeie.s. 



Portage gi-oup. Jjoke Brie shore, Chautaiiqua Co., N. Y. 

 Ki(f. H. A right valve. 



Fig. 15. An enlargement of the siirfiu-e, incorrectly representtjd. 



Fig. 1*5. A left valve of an old individual pi-eseuting strong obliciue folds on the middle of the shell. 

 Portjige gi"oup. Lake Erie shore, Chautauqua Co., N. Y. 



8cHIZODU8 UEGRNER. 

 Page 468. 

 Fifir. 17. A left valve. The umbo and beak are too much elevated in the figure. 



PaKACYCL.VS itOTUNDA. 

 Page 444. 



See Plate 95. 

 Fig. 18. A right valve. 



Chemung group. Bnxnne Co., N. Y. 

 Fig. 19. A left valve. 



Chemung group. Browne Co., N. Y. 



SCHIZODUS PATULUS. 



Page 457. 

 Fig. 20. A left valve. 



Chemung gi-oup. Near Mansfield, Pa. 



PALJ'iOMYA OBLONOA. 

 Page 509. 

 Fig. 21. A <-a8t of the interior of a left valve showing muscular imprints and strong concentric undulations 

 of growth. 



Hamilton group. Schoharie Co., N. Y. 



