PLATE LXXI. 
Lunulicardium fragile. 
Page 434. 
Figs. 1-8. A series of valves representing- the prevailing characters of this species, enlarged to two diameters 
Fig. 9. A specimen retaining both valves in conjunction, enlarged to four diameters. 
Genesee slate. Bristol Centre, N. Y. 
Fig. 10. A small right valve, enlarged to four diameters. 
Fig. 11. A specimen retaining both valves. 
Genesee slate. Bristol Centre, N. Y. 
Fig. 12. A left valve showing the expansion of the shell along the posterior margin, enlarged to two diameters 
Genesee slate. Indian reservation, Erie Co., N. Y. 
Fig. 13. A large left valve, enlarged to two diameters. 
Genesee slate. Penn Yan, Yates Co., N. Y. 
Fig. 14. The interior of two valves, enlarged to four diameters. 
Genesee slate. Penn Yan, N. Y. 
Lunulicardium Marcellense. 
Page 435. 
Figs. 15, 16. Two left valves retaining portions of the test. 
Marcellus shale. Cherry Valley, N. Y. 
Lunulicardium rude. 
Page 435. 
Fig. 17. A right valve, showing the form and surface characters. 
Goniatite limestone. Cherry Valley, N. Y. 
