CRETACEOUS PERIOD. 

 Fig. 845-850. 



463 



'V sr ■ ^jj,;.- 





^S0 



Cephalopods. — Figs. 845, 845 a, 845 6, Ammonites placenta; 846, Scaphites Conradi; 847, S. 

 larvseformis ; 848, 848 a, Baculites ovatus ; 849, Section of B. compressus, reduced ; 850, Nautilus 

 Dekayi. 



donts, which have teeth with sharp cutting edges, besides other pecu- 

 liarities. A tooth of one large species is represented in Fig. 852. 

 Several species of Teliosts have been described by Cope, from the 



