CLASS V CEPHALOPODA 635 



Subfamily C. Carnitinae Arthaber. 



Form and sculpture like that of the Sageceratinae, except that in the Carnitinae 

 there is a tendency towards the development of ribs and knots. The septa are no 



Fig. 1191. 



Pseudosageceras intermontanum H. and S. 

 Lower Trias ; Idaho, x 3/^. 



Fig. 1192. 



Sagcceras haidingeri (Hauer). Upper Trias ; 

 Hallstadt, Austria. 



Fig. 1193. 



Septa of Arthaberites alexandrae Diener. Middle 

 Trias ; Alps (after von Arthaber). 



longer lanceolate, but ceratitic or even largely digitate. 

 lobes is Short, but usually highly complex. This 

 groiip probably serves as a connecting link be- 

 tween the Sageceratinae and the Pinacoceratinae. 



Garnites Mojs. ; Procarnites Art.; Arthaberites 

 Diener (Fig. 1193); LanceoUtes Hyatt and Smith; 

 Hauerites and Bamhanagües Mojs. ; Bosnites Hauer; 

 Tihetites Mojs. Trias. 



Subfamily D. Pinacoceratinae Mojsisovics. 

 Forms thin, compressed, with acute venters. 



The adventitious series of 



Lobes and saddles all finely digitate. Adventitious 

 and auxiliary lobes numerous. 



The Pinacoceratinae reach the highest degree 

 of complication of the septa found in any group 

 of Ammonites. The general plan of their septa 

 suggests a derivation from the Carnitinae, and 

 through them from either Hedenstroeminae or 

 Sageceratinae. It is also possible that the sub- 



Pinacoceras layeri (Hauer). Upper Trias ; 

 Rötheistein, near Aussee, Austria. 



