NORITINAE Karpinsky 



Uddenites nov. gen. 



Type: Uddenites Schucherti Bose 



While the Noritinae in the Russian Artinsk are well represented by 

 numerous species of Pronorites and especially Parapronorites, and in 

 the Sicilian Sosio beds by an abundance of specimens of at least one 

 Parapronorites, this sub-family has very few representatives in the 

 Permo-Carboniferous of the Glass Mountains and even these few 

 belong exclusively to the very lowest horizon, the Wolfcamp forma- 

 tion. The only member of the Noritinae in our region is the new 

 branch, Uddenites, which is represented by two species. 



Karpinsky^ has shown that the Prolecanitidae developed during the 

 end of the Carboniferous and the Permian, three different branches: 

 the Medlicottinae, the Noritinae, and the Lecanitinae. Most of these 

 forms have a discoidal shape with strongly compressed flanks, but 

 while the Noritinae and Lecanitinae show a rounded ventral region, the 

 Medlicottinae develop a more or less deep furrow in this part. 



Our new genus unites to a certain degree the characters of the Nori- 

 tinae and the Medlicottinae ; it shows the typical sutures of Pronorites 

 (pi. I, fig. 26) on the inner whorls and later on develops a suture which, 

 though different from that of Pronorites, is still intimately related to 

 it; and while the inner whorls show the general form of Pronorites 

 with its rounded ventral region (pi. I, fig. 33, 36) the larger ones 

 develop a deep furrow (pi. I, fig. 37, 38) in that place, so that the 

 outer form somewhat resembles that of Propinacoceras, although it 

 does not have the tubercles on the ventral region. Uddenites cannot 

 be considered as a stage in the development of Medlicottia, Sicanites 

 or Propinacoceras, as such a stage is not observed in the evolution of 

 the suture of these genera, and we have to consider our genus as an 

 independent, although possibly local, branch developed from Pro- 

 norites, parallel to Parapronorites and belonging to the same sub- 

 family, the Noritinae. 



The characters of our new genus are : 



^Karpinsky, Amm. d. Artlnsk-Stufe, p. 41-45. 



