PLATE III. 



PAGE. 



OrTIIOCEKAS TUKBIDITM 100 



Fig. 1. View of tlie specimen describeil, sliowing the remain.s of longitudiual ridges. 



Ortiioceea.s Duseri 97 



Fig. 2. View of the perfect .specimen from which the species was described, showing all the charac- 

 ters of the shell except the outer chamber. 



3. View of a septum, and a single bead of the siphuucle, as seen in a section of the upper part 



of the .specimen tig. 2 l)y breaking. 



4. En'argeTnent of the surface, showing the pecviliar reticulated texture of the surface under a 



magnifier, when well preserved. 



GOMPHOCERAS EOS - 100 



Fig. 5. View of the specimen described, showing the outer chamber and several septa. 



