CLARS V 



CEPHALOPODA 



6?/ 



complex digitale, hut always with few lobes and saddles ; auxiliary series, if present, 

 short ; adventitious series consisting of not more than one lobe. 



Fio. 1201. 



Septa of Thalaasoceras 

 phillip.n Gemmel. Permiaii ; 

 Sicily (after Geminellaro). 



Fio. 1202. 



Septa of Ussuria waageni Hyatt and Smitli. 

 Lower Trias ; Idaho. 



of tlie Devonian and Lower 



Fig. 1200. 



Dimorphoceras texanum Smith. Goal 

 Measures ; Texas, x i/i (after J. P. Smith). 



This familj is probably derived from 

 Carboniferous. There is a 

 general resemblance to the 

 development of the Canii- 

 tinae, in tlie formation of 

 adventitious lobes, but 

 there is probably no kinship 

 with that group, 



Dimorphoceras Hyatt 

 (Fig. 1200). Carboniferous. 

 Thalassoceras Genim. (Fig. 

 1201). Permian. Ussuria 

 Diener (Fig. 1202). Lower 

 Trias. Sturia Mojs. Alpine 

 Trias. 



Family 11. Ptychitidae 

 Mojsisovics. 



Similar in aspect to 

 the more robust forms of 

 Meelcoceratidae, but having 

 subacute venters, more com- Fio- 1203. 



vlex SUtureS and the auxil- Ptychifes flexuosiis'M.oisi. ( = Ammo)iites studeri ümifr it.-p.). Muschelkalk; 

 ■^ • ' • 7 . Schreyer Alp, Salzburg, Austria. 



lary series straighter. 



Ptychites (Fig. 1203), Japonites and Nannites Mojs.; Parannites Hyatt and Smith. 



Owenites Hyatt and Smith. Trias. 



