PLATE LXV. 
Sl’HENOTUS TRUNCATUS. 
Jfage 391. 
Fig-. 1. A small right valve. 
Hamilton group. Schoharie Co., N. Y. 
Fig. 4. A specimen preserving both valves. 
Hamilton group. Schoharie Co , N. Y. 
Fig. 5. A smaller individual enlarged to two diameters. 
Hamilton group. Shore of SkaneateJ.es lake, iV". Y. 
Fig. 6. A left valve showing unusually strong concentric undulations. 
Hamilton group. Schoharie Co., N. Y. 
OrTHONOTA ? PARYULA. 
Page 182 . 
See Plate 78. 
Figs. 2, 3. Left and right valves. The fold on the post-cardinal slope is too strongly represented. 
SPHENOTUS ARC2EFORMIS. 
Page 395. 
See Plate 66. 
Figs. 7-10. Four right valves showing some variation in form and proportions. 
Fig. 11. A left valve. 
Hamilton group. Delphi, JST. Y. 
Sphenotus CUN EA T U S. 
Page 390. 
Figs. 12-14. Three valves presenting the usual characters of this species. 
Hamilton group. Schoharie Co., 1ST. Y. 
Fig-. 15. The right side of a small specimen retaining the valves in conjunction. 
Hamilton group. Schoharie Co., N. Y. 
Fig. 16. A large right valve. 
Hamilton group. Schoharie Co , i\ r . Y. 
Fig. 17. A large specimen with the valves conjoined. 
Hamilton group. Schoharie Co., JSf. Y. 
