PLATE XCV— Continued. 
Paracyclas Oiiioensis. 
Page 442. 
See Plate 72. 
Fig-. 24. The left side of a specimen showing- the form and surface characters.’ 
Hamilton group. Falls of the Ohio river. 
Paracyclas tenuis. 
Page 443. 
See Plate 72. 
Fig-. 25. The right valve, natural size, showing- the Torm and surface markings. 
Hamilton group. Shore of Skaneateles lake, N. Y. 
Schizodus, sp. undetermined. 
Fig. 26. The interior of a left valve as obtained from a g-utta-percha impression showing the cardinal teeth, 
muscular scars and pallial line. 
Hamilton group. Pa. 
SCHIZODUS GREGARIUS. 
Page 452. 
See Plate 75. 
Fig. 27. A left valve, natural size. 
Chemung group. Near Tioga, Pa. 
Schizodus eminens. 
Fig. 28. A large right valve. 
Chemung group. 
Page 457. 
Near Gfuilford, Chenango Co., N. Y. 
Schizodus aiqualis. 
Page 459. 
See Plate 75. 
Fig-. 29. l'he left side of a specimen. 
Waverly group. Licking Co., Ohio. 
„ Cytherodon NASUTUS. 
Page 5J!. 
See Plate 75. 
Fig. 30. The left side of the tyjAcal specimen, which is a cast of the interior, showing muscular scars. 
Hamilton group. Hardy Co., Va. 
Dystacxella subnasuta. 
Page 512. 
See Plate 51. 
Fig. 31." Cardinal view of a specimen retaining the test, showing the folder callosity in front of the beaks. 
Hamilton group. Near Louisville, Ky. 
