634 



MOLLUSCA 



PHYLUM VI 



Family 8. Pinaooceratidae Mojsisovics. 



Forms with involute, compressed, high whorls, with narrow and often acute venters. 

 Body -Chamber short. Septa goniatitic to ceratitic^ to digitale^ hut always with adventitious 

 and auxiliary lobes in addition to the regulär series. 



The group is probably derived from the Beloceratinae, at least in so far as it is 

 a Unit. This is almost certainly true of the Sageceratinae and the Hedenstroeminae ; 

 the Carnitiiiae are probable derivatives of the Hedenstroeminae, and the Pinaco- 

 ceratinae apparently are derivatives from the Sageceratinae. 



Subfamily A. Hedenstroemiinae Waagen. 



Principal lobes and saddles with ceratitic outlines, but adventitious lobes and 



___...._._,,.,— „^ saddles have Sageceras -like outlines. 



HHHHH|^^^^^^^^^^^^^^^^H Antisiphonal lobe very long. 



^^^^^^^^^^^^^^^^^^^^^^^^H Dorsal more complex than 



1 1 RH^^HI^^^^^^^^^^^^^^^^H in preceding families. Aperture with 



^ I ^m ^^^^r ^^^^^^^^^H Hedenstroemia Waagen {Glypites 



■ I rW jHf ^^^^^^^H ^^aagen) (Fig. 1189); Prodromites 



Tjm} ^^ ^^aS^B ^"^^*^ ^^^ Weller (Fig. 1190); 



'f^m Äspenites H. and S. ; Longohardites 



"^W Mojs. Carboniferous to Trias. 



Fig. 1189. 

 Hedenstroemia kossimUi H. and S. 



Lower Trias ; Idaho. 



Fig. 1190. 

 Prodromites gorbyi Miller. Lower Carboni- 

 ferous ; Missouri. 1/2 (after J. P. Smith). 



Subfamily B. Sageceratinae Hyatt. 



Similar to the last, but lateral lobes bifid, and saddles acutely spade-shaped. 

 Adventitious and auxiliary lobes numerous. Antisiphonal lobe bifid. Aperture has 

 smuous lateral outlines with crests at the ventro-lateral ridges. 



Iseudosageceras Diener (Fig. 1191); Sageceras Mojs. (Fig. 1192). Permian and 

 i rias. 



