PLATE LXX. 
Cardiola fluctuans, Barr. 
Fig. 1. Cardinal view of the right valve, showing the triangular area under the healt. 
introduced for comparison with American allied forms. See plate 94, fig. 23. 
Silurian. Bohemia. 
This species is 
Gryptocardia speciosa. 
’ Page 426. 
See Plate 80. 
Figs. 2, 3. Views of two specimens retaining both valves in conjunction, enlarged to four diameters. 
Genesee slate. Bristol Centre, N. Y. 
Fig. 4. A right valve enlarged to four diameters. 
Genesee slate. Ontario Co., N. Y. 
Fig. 5. An enlargement of a small left valve. 
Figs. 6-8. Three valves showing strong surface ornaments. 
Portage group. Branchport, 2V. Y. 
Fig. 9. A right valve enlarged to three diameters, showing strong arching lamellose striae on the radii. 
Marcellus shale. Skaneateles, N. Y. 
Paracardjum Doris. 
Page 428. 
Figs. 10, 11. Two valves of this species enlarged to six diameters. 
Portage group. Casliaqua creek, N. Y. 
Pararca transversa. 
Page 429. 
Fig. 12. A left valve. 
Chemung group. Salamanca, N. Y. 
Figs. 14, 15. Two right valves. 
Chemung group. Salamanca, 2V. F. 
Fig. 
Pararca neglecta. 
Page 432. 
13. A left valve showing the form and surface characters. 
Waverly group. Meadville, Pa. 
