PLATK XCV— Coiilimicil. 



P.VKACYCLAS OlIIOENSIS. 

 Page Ui. 



See Plate 72. 

 Fig. 34. The left side of a specimen showing the form and surface (■hiua<:t('i-s. 

 Hamilton group. tlUis of the Ohio river. 



Paracyclas tenuis. 



Page 443. 

 See Plate 72. 



Fig. 25. The right valve, natural size, showing the form and surface markings. 

 Hamilton group. Stim-e of Skaneateles lake, N. Y. 



ScHizoDUS, sp. uiKletcniniued. 



Fig. 26. The interior of a left valve as obtained from a gutta-pereha impression showing the cai-dinal teeth, 

 muscular scars and pallial line. 

 Hamilton gi-oup. Pa. 



SCHIZODUS OKEGAKIU8. 

 Page 4M. 

 See Plate 7.'). 

 Rg. 27. A left valve, natural size. 



Chemung group. Near Tioga, Pa. 



' SCHIZOUUS EMINENS. 



Pago 487. 

 Fig. 28. A larg^ right valve. 



Chemung group. Near Guilford, Chenango Co., N. Y. 



SCHIZODUS ii;QUALI8. 

 Pago 459. 

 See Plate 75. 

 Fig. 29. The left side of a specimen. 



Waverly gi-oup. Licking Co., Ohio. 



CyTHERODON NASUTU8. 

 Page fill. 

 See Plate 75. 

 Fig. 30. The left side of the typical specimen, which is a cast of the interior, showing muscular scare. 

 Hamilton group. Hardy Co., Va. 



Dystactella subxasuta. 



I'age 512. 

 See Plate 51. 

 Fig. 31. Cai-dinal view of a specimen i-etaining the test, showing the fold or callosity in front of the beaks. 

 Hamilton group. Near Louisville, Ky. 



