PLATE XCIV. 
Fig-. 
Sphenotus Telamon. 
Page 406. 
1. A large right valve. 
Chouteau limestone. Cooper Co., Mo. 
Spiienotus contractus. 
Page 399. 
See Plate 66. 
Fig. 2. The internal mould of a right valve showing muscular scars and jDallial line. 
Chemung group. Warren, Pa. 
Sphenotus signatus. 
Page 405. 
Fig. 3. A left valve showing the form and surface characters. 
Waverly group. Wan-en, Pa. 
PHTHONIA TRUNCATA. 
Page 476. 
Fig. 4. An imperfect left valve, showing the surface ornamentation. 
Chemung group. Near Panama, N. Y. 
PHTHONIA N1T1DA. 
Page 477. 
Fig. 5. The right side of a specimen preserving- both valves, showing the form and surface characters 
Fig. 6. A smaller left valve. 
Chemung group. T Varren, Pa. 
Prothyris alata. 
Page 46t. 
Fig. 7. A specimen preserving both valves in conjunction. 
Chemung group. Philipsburgh, Alleghany Co., N. Y. 
Prothyris planulata. 
Page 460. 
See Plate 76. 
Fig. 8. A large left valve showing the form and surface ornamentations. 
Hamilton group. Norwich, Chenango Co., N. Y. 
