GLASS V 



CEPHALOPODA 



633 



inflections. Apertures have crests at the A'^entro-lateral angles ; straight or with faint 

 sutures at the venter. 



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



Fi<;. 1184. 



Septa of Gonlillerites angulatus Hyatt aud Sinitli. 

 Lower Trias ; Idaho. 



Fic. I isj. 



I'rono ri ies i-ycloluh us (Ph i 1 1. ). 

 Lower Carboniferous ; Gra.ss- 

 innton, Yorkshire (after 

 Phillips). 



Fiu. 1183. 



Fig. 11S5. 



.Septa of I'ronorite.s arkansaaansis Suture-line of Triainoceras 

 .Smith. Lower Carboniferous; Arlcansas. tiiherculoso-costatnin (Sandb.). Up])er 

 1/.. (after J. P. Smitli). Devonian. 



Fk.'. Il8(j. 



Suture-line of Norites 

 gondola Mojs. Muschelkalk ; 

 Schreyer Alp, near Hallstadt, 

 Austria. 



Geinni. ; CurdiUerites Hyatt trnd Smith (Fig. 1184); (1) Ambit e.sWaagen ; NoritesUoy 

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



Sulifamily C. Medlicottiinae Karpinsky. 



Shells compressed, discoidal and involute, with smooth or costated sides, and 

 often costated or tuberculated and channelled venter. 

 Ventral lobe entire in primitive species, and trifid or 

 divided as among the primitive Noritinae in more specialised 

 forms. First lateral saddles simple but divided in primi- 

 tive genera, and acquire in Medlicotiia through hyper- 

 trophy and the development of marginals extraordinary 

 serrated outlines. Aperture as in the Noritinae. 



Sicanites Gemm. ; Promedlicottia Karp. ; Propina- 

 coceras Gemm. ; E'piscujeceras Noetling ; Medlicottia 

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



Fiii. 11S7. 



Suture-liue of Medlirottiajirimas Waagen. Permo 

 Carboniferous ; Salt Range, India (after Waagen). 



Medlicottia trautscholdi Genini. 

 Fernio-Carboniferous ; Sosio, 

 Sicily (after Gemmellaro). 



