HUDSON PERIOD. 



221 



rophon bilobatus, figs. 308, 309; Trocholites Ammonms, fig. 318; and some 

 Cephalopods of the Orthoeeras family, etc. There are also in the rocks of this 



Fie. 349. 



Echinoderm. — Palasterina (?) Jamesii. 



period, and characteristic of them, the Conchifers Avicula demissa, fig. 350; 

 Ambonychia radiata, fig. 351; Modiolopsis modiolaris, fig. 352; Orthonota paral- 



Figs. 350-353. 



Conchifers. — Fig. 350, Avicula demissa ; 351, Ambonychia radiata ; 352, Modiolopsis 

 modiolaris (X %) 5 3 &3, Orthonota parallela. 



lela H., fig. 353. Among the Gasteropods occurs the Cyrtolites ornatus, near 

 fig. 310. 



