HUDSON PERIOD. 



221 



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

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



Fig. 349. 



Echinoberm. — Asterias Anthonii. 



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

 Ambony clua radiata, fig. 351; 3Iodiolopsis modiolaris, fig. 352; Orthonota par al- 



Figs. 350-353. 



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

 modiolaris (X %) ', 353, Orthonota parallela. 



Jela H., fig. 353. Among the Gasteropods occtirs the Cyrtolites ornatus, near 

 fijr. 310. 



