CEPHALOPOD ADAPTATIONS 



PLATE 6 





End Profiles of Various Cephalopod Shells, Reduced One-half 

 Fig. i. Nautilus pompilius Linne, the best known existing species of Nautilus. 

 Fig. -l. Poly ptychiteslatkostav on Koenen. Neocomian of Germany. (After von Koenen.) 

 Fig. 3. Tropites subbullatus (Hauer). Upper Triassic of Austria. (After Hauer.) 

 Fig. 4. Cyclolobus stacheiGcmmdla.ro. Late Paleozoic of Sicily. (After Gemmellaro.) 

 Fig. 5. Placenticeras meeki Boehm. Upper Cretaceous of South Dakota. 



