THE TRIASSIC PERIOD. 



51 



g h 



Fig. 344. — A Group of Triassic Cephalopods: a, Trachyceras austriacum Mojs.; 

 b-c, Tropites subbullatus Hauer; d, Choristoceras marshi Hauer; e-h, Ceratites 

 nodosus de Haan, lateral and ventral views of the shell and two sections of the 

 suture, one (g) showing the ventral or siphonal lobe with the lateral lobes and 

 saddles, the other (h) showing the dorsal or anti-siphonal lobes, with lateral lobes 

 and saddles. 



