CLASS V 



CEPHALOPODA 



649 



phylogerontic, liaviiig oiily six entire or vciy faintly denticulated lobes, and six 

 entire saddles. Ventral lobe divided, and tlie antisiphonal either entire or bifid at 



Fig. 1237. 



Trachycerasaustriacum Mojs. Upper Trias ; 

 Rötheistein, near Aiis.see, Austria. 



Fig. 1238. 



Protrachyceras archelaus Laube. Upper Trias (Norian) ; 

 Bakony, Hungary (after Mqjsisovics). 1/2- 



Fig. 1239. 



(Jlionites fairhanksi H. and S. Upper Trias ; 



California (after Hyatt and Smith). 



Fig. 1240. 

 Septa of Clionites fairbanlcsi H. and S. x 1/2- 



./Vr^y- 



Fig. 1241. 



Polycydus nastur- 

 tium (Dittmar). 

 Keuper ; Sandling, 

 near Aussee. 



FiO. 1242. 



Choristoceras marshi 

 Hauer. Rhaetic ; Kendel- 

 engraben am Osterhorn, 

 near Salzburg. 



its extremity. Dorsal lobes and saddles otherwise entire. Connected through 

 Polycydus with Buchites, according to Mojsisovics. 



Polycydus (Fig. 1241), Peripleurites Mojs.; Choristoceras (Fig. 1242), Rhahdoceras 

 Hauer (Fig. 1243). Trias. 



