PLATE LXXI. 



LUNULICARDIUM FRAGILE. 

 Page 434. 



Figs. 1-8. A series of valves representing the prevailing chai-acters of this species, enlarged to two diameters. 

 Fig. 9. A specimen retaining both valves in conjunction, enlarged to four diameters. 



Genesee slate. Bristol Centre, JV. Y. 

 Fig. 10. A small right valve, enlarged to four diameters. 

 Fig. 11. A specimen i-etaining both valves. 



Genesee slate. Bristol Centre, N. Y. 

 Fig. 12. A left valve showing the expansion of the sheil 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 diametei-s. 



Genesee slate. Penn Yan, Yates Co., N. Y. 

 Fig. 14. The interior of two valves, eulai-ged to four diameters. 



Genesee slate. Penn Yan, N. Y. 



LuNULIOAKmUM Mauoellknse. 



Pago 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 foi-m and surface charactei-s. 

 Goniatite limestone. Cherry Valley, N. Y. 



