GEOLOGY OF THE FOURTH DISTRICT. 



ORGANIC REMAINS OF THE NIAGARA GROUP. 



No. 19. 



Fig. 1. Platynotus Boltoni, Conrad, Annual Reports. (Paradoxides Boltoni, Bigsby. Green-, 

 Monograph, p. 60). This is one of the most rare and beautiful of the trilobitcs 

 in the Niagara group. Lockport. 



Fig. 2. Bumastis barriensis. Specimen of the ordinary size. Lockport. 



Fig. 3. Asaj>hus coryphceus. (Jour. Acad. Nat. Sci. Vol. 8, page 277, pi. 16, fig. 15). Lock- 

 port. 



