Orthoceras sp. 



1 6 Vertical median section through a specimen of undetermined species, 

 showing siphuncle and siphuncular beads together with thickened 

 septal deposits 

 Locality. Presque Isle stream 



Platyceras hebes Clarke 



(See plate 12) 

 Page 101 



17-19 Three illustrations of this species 

 Locality. Edmunds Hill 



211 



