CLASS V 



CEPHALOPODA 



639 



Subfamily B. Haloritinae Mojsisovics. 



Shells luore globose and more involute in the young than in the Tropitidae, and 

 usually keelless, but having 

 similar volutions in a number 

 of species during 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), 



Fig. 1207. 



Juvavites suhintrrniptus Mojs. 

 Upper Trias ; California (after Hyatt 

 and Smith). 



Fio. 1-208. 



Sagenites herbichi Mojs. Upper Trias ; California 

 (after Hyatt and Smith). 



Jovites, Parajuvavites, Juvavites (Fig. 1207), (Anatomites, Griesbachites, Dimorphites), 



Miltites, Metasibirites, 

 Sagenites (Trachysagenites) 

 Mojsisovics (Figs. 1208, 

 1209). Trias. 



Fig. 1209. 



Septa ot Sagenites herUchi Mo.js. Upper Trias ; California 

 (after Hyatt and Smith). 



^W-W ^ 



Fic. 1210. 



Septa of AcrochonUceras 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 



