4Q8 



THE TRIASSIC PERIOD 



seas, and a part perhaps in gulfs and bays. The marine life was 

 scanty, and its origin and relations uncertain; but it seems to have 

 been largely independent of the Mediterranean basin. 



Fig. 421. A GROUP OF TRIASSIC CEPHALOPODS. a, Trachyceras austriacum 

 Mojs.; b-c, Tropites subbullalus Hauer; d, Choristoceras marshi Hauer; e-f, Ceratites 

 nodosus de Haan, lateral and ventral views of the shell. 



