Fk 
Fig. 
Fig. 
Fig. 
Fie-. 
Fig. 
Fig. 
Fie. 
Fig. 
Fig. 
PLATE XCIV—Continued. 
Panenka abrupta. 
Page 423. 
See Plate 69. 
16. The left side of a specimen with the valves slightly displaced. 
Hamilton group. Near Cumberland, Md. 
Panenka equilatera. 
Page 419. 
See Plate 69. 
17. The left side of a specimen showing- the form and surface markings. 
Hamilton group. Delphi, N. Y. 
Panenka multiradiata. 
Page 417. 
See Plate 69. 
18. The right side of the specimen described. 
Corniferous limestone. Clarence Hollow, Erie Co., N. Y. 
Pararca prascedens. 
Page 429. 
19. An imperfect left valve as obtained from a gutta-percha impression of a natural mould. 
Corniferous limestone. Cayuga, Canada West. 
Pararca erecta. 
- Page 432. 
See Plate 70. 
20. A left valve showing the form and surface markings. A profile of this valve is represented at the 
right of the figure. 
Waverly group. Warren, Pa. 
21. The hinge of a right valve showing the minute crenulations. 
Waverly group. Warren, Pa. 
Pararca venusta. 
22. A right valve. 
Chemung group. 
Page 431. 
Warren, Pa. 
Cardiola fluctuans, Ban-ancle. 
See Plate 70. 
23. A right valve showing the form and surface ornamentations. Introduced for comparison with the 
species of Panenka, Parakca and allied forms. 
Silurian. Bohemia. 
Lunulicardium transyersum. 
Page 439. 
24. Cardinal view of the specimen described, showing the hiatus along the cardinal line. 
Chemung group. Elmira, N. Y. 
25. The left side of the preceding. 
