CLASS V 



CEPHALOPODA 



649 



phylogerontic, having only six entire or very faintly denticulated lobes, and six 

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



.1 i- 



Fig. r_'37. 



Tmchycrras austriaciim Mojs. Upper Trias ; 

 Riithelstein, near Anssee, Au.stria. 



Fig. 1238. 



Protradiyceras archelaus Laube. Upper Trias (Norian) ; 

 Bakony, Hungary (after Mojsisovics). i/o. 



Fio. 1-230. 



Clionites fairbanlsi H. and S. Upper Trias ; 

 California (after Hyatt and Smitli). 



Fig. 1240. 

 Septa of Clionites fairbanlcsi H. and S. x V2- 



^y\;^^'v./- 



Fio. 1241. 



Polycydiis nastiir- 

 tiwrn (Dittmar). 

 Keuper ; Sandling, 

 near Aussee. 



Fio. 1242. 



Choristoceras inarsTd 

 Hauer. Rliaetic ; Kendel- 

 ongraben am Osterhorn, 

 near Salzburg. 



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

 Polycyclus with Buchites, according to Mojsisovics. 



Pohjcyclus (Fig. 1241), Peripleurites Mojs.; Choristoceras (Fig. 1242), Rhabdoceras 

 Hauer (Fig. 1243). Trias. 



