P ermo-C arhoniferous Ammonoids of the Glass Mountains 59 



first lateral lobe is not even half as long as the antisiphonal one; it 

 is slightly asymmetrical and somewhat curved with the convexity 

 toward the antisiphonal side. Then follows a second and quite in- 

 significant lateral lobe, the top of which is about as high as that of the 

 first lobe, while the depth is about one-fourth of that of the preceding 

 one. This lobe lies near the umbilical seam. 



The internal saddle is high, slender, slightly curved with the con- 

 vexity toward the antisiphonal region, and a little constricted. The 

 first lateral saddle is very small and narrow, rounded at the top and 

 constricted near the base ; it leans a little over toward the antisiphonal 

 region. A second insignificant saddle develops on the umbilical seam 

 and forms the internal flank of the seventh auxiliary saddle of the 

 external suture. While the lateral saddles and lobes are far apart in 

 two suture lines following each other, the antisiphonal lobe touches 

 the inner flanks of the internal saddles of the next older septum. 



The development of the sutures in our genus shows clearly that it 

 was derived from Pronorites, the inner whorl still showing the general 

 form and the suture of that genus. The later developmnt is entirely 

 different, somewhat similar to Propinacoceras, but the suture is en- 

 tirely different. If we regard the general features of the adult suture, 

 we find that it shows a certain relation to Parapronorites on one side, 

 and to Daraelites on the other. Characteristic is the low external 

 saddle and the excessively broad first lateral lobe. The short ex- 

 ternal saddle occurs in both those genera named above, while the broad 

 - first lobe is especially pronounced in Parapronorites, althovigh in Darae- 

 lites this element is certainly wider than any of the following ones. 

 The first lateral lobe has very different secondary elements in our 

 genus, while in Parapronorites they consist' more or less of little saw- 

 tooth-like saddles and lobes and in Daraelites we observe only a very 

 minutely serrate first lobe. All the rest of the lobes in Parapronorites 

 are bifid with the exception of the last ones, which end in a point. In 

 Daraelites they are serrated or rounded. 



These relations show that our genus holds a position similar to 

 that of Parapronorites and Daraelites, which latter one has allso 

 similar internal lobes ; and that Uddenites is to be regarded as an in- 

 dependent branch of the Noritinae. 



