PLATE LXX. 



Cardiola fluctuans, Bavr. 



¥ig. 1. Cardinal view of the right valve, showing the triangular area under the beak. This species is 

 introduced for comparison with American allied forms. See plate 94, fig. 23. 

 Silurian. Bohemia. 



Gl..YPTOCARniA SPECIOSA. 

 Page 426. 

 See Plate 80. 

 Figs. 2, 3. Views of two specimens retaining both valves in conjunction, enlarged to four diameters. 



Genesee slat«. Bristol Centre, N. ¥. 

 Fig. 4. A right valve enlarged to four diametere. 



Genesee slate. Ontario (k>., N. Y. 

 Fig. 5. An eidargement of a small left valve. 

 Figs. 6-8. Three valves showing strong surface ornaments. 



Portage gi-oup. Brawliport, N. Y. 

 Fig. 9. A right valve enlarge<l to three diametei's, .showing .strong arching lamellose striae on the radii. 

 Marcellus shale. Skaneateles, N. Y. 



Paracakdium Dori.s. 



Page 428. 

 Figs. 10, 11. Two valves of this species enlarged to six diameters. 

 Portage group. Cashaqua creek, N. Y. 



Pabarca transversa. 



Page 429. 

 Fig. 12. A lefl valve. 



Chemung group. Salamanca, N. Y. 

 Figs. 14, 15. Two right valves. 



Chemung group. SaJamaniu, iV. F. MB 



Par ARC A NEGLEOTA. 

 Page 432. 

 Fig. 13. A left valve showing the form &nd surface characters. 

 Waverly group. Meadmlle, Pa. 



