CEPHALOPOD ADAPTATIONS 



PLATE 



Fig. i . Ascoceras, based upon Ascoceras bohemicum Barrande, from the Silurian of Bohemia. 



Fig. z. Proterocamerocerasbrainerdi (Whitfield). Ordovicianof New York. (After Ruedemann.) 



Fig. 3. Piloceras. (After restoration by Ruedemann.) An Ordovician type. 



All in median longitudinal section. 





