CLASS V 



CEPHALOPODA 



639 



Subfamily B. Haloritinae Mojsisovics. 



Shells more globose and more involute in tlie young than in tlie Tropitidae, and 

 usually keelless, but having 

 similar volutions in a niimber 

 of species diiring later stages. 

 Ornament as a rule simpler 

 than in Tropitidae. Aper- 

 ture usually with ventral 

 crests, but these are primitive 

 in outline, broad, and in some 

 species scarcely indicated by 

 the lines of growth. 



Halorites {Homerites), 



W^-> 



Fic. 1207. 



Juvavites subinterruptus Mojs. 

 Upper Trias ; California (after Hyatt 

 and Smith). 



Fig. 1208. 



Sagenites herbichi Mojs. Upper Trias ; California 

 (after Hyatt and Smith). 



JoviteSj Parajuvavites, Juvavites (Fig. 1207), {Anatomites, Grieshachites, Dimorphites), 



Miltites, Metasibirites, 

 Sagenites {Trachy sagenites) 

 Mojsisovics (Figs. 1208, 

 1209). Trias. 



l 



Fig. 1209. 



Septa of Sagenites herbichi Mojs. Upper Trias ; California 

 (after Hyatt and Smith). 



^^Wi 



Fio. 1210. 

 Septa of Acrochordiceras hyatti 

 Meek. Middle Trias ; Nevada (after 

 Hyatt and Smith). 



Subfamily C. Sibiritinae Mojsisovics. 

 Forms robust and highly ornamented, with strong lateral ribs and knots. Septa 



