CLASS V 



CEPHALOPODA 



633 



inflections. Apertures have crests at the veiitro-lateral angles ; straight or with faint 

 sutures at the venter. 



Pronorites Mo^s. (Figs. 1182, 1183); Triainoceras Hyatt (Fig. 1185); Farapronorites 



Fic. 1184. 



öepta of Gordlllerites angulatus Hyatt aud Smith. 

 Lower Trias ; Idaho. 



Fi(i. HS 



l'ronorUet>cydolohus(P\nU.). 

 Lower Carbonlferous ; Grass- 

 iugtoii, York.shire (after 

 Phillips). 



Fig. 1188. 



Septa of l'ronorites urkannasensL- 

 Öinith. LowerCarboiiiferous; Arkansas. 

 i/-' (alter J. P. Smith). 



Fig. 1185. 



Suture-line of Triainocaras 

 tuherculoso-costatum (Sandb. ). Upper 

 Devonian. 



^^IWI*^ 



Fk;. 118(5. 



Suture-line of Nuritea 

 gomlola Mojs. Muschelkalk ; 

 Schreyer Alp, near Hallstadt, 

 Anstria. 



Gemm. ; Cordülerites lüyatt und Smith (Fig. 1184); (1) Amb^tes^Y'da,gen ; iVoWies Mojs. 

 (Fig. 1186); Daraelites Genim. Devonian to Trias. 



Subfamily C. Medlicottiinae Karpinsky. 



Shells compressed, discoidal and involute, with sinooth or costated 

 often costated or tuberculated and channelled venter. 

 Ventral lobe entire in primitive species, and trifid or 

 dividedas amoiig the primitive Noritinae inmorespecialised 

 forms. First lateral saddles simple but divided in primi- 

 tive genera, and acquire in Medlicottia through hyper- 

 trophy and the development of marginals extraordinary 

 serrated outlines. Aperture as in the Noritinae. 



Sicanites Gemm.; Promedlicottia Karp.; Propina- 

 coceras Gemm. ; Episageceras Noetling ; Medlicottia 

 Waagen (Figs. 1187, 1188). Permian to Lower Trias. 



sides, and 



Fig. 1187. 

 Suture-line of Medlwottia primas Waagen. Pernio- 

 Carbonlferous ; Salt liange, India (afler Waagen). 



Medlicottia trautsrholdi Gemm. 

 Pernio -Carbonlferous ; Sosio, 

 Sicily (after Genimellaro). 



