62 University of Texas Bulletin 



rounded at the top and constricted near the base ; it leans a h'ttle over 

 toward the antisiphonal region. A second and very insignificant 

 saddle begins on the umbilical seam and is really not more than the 

 flank of the seventh auxiliary saddle on the umbilical wall. 



The internal sutures described above were observed on a whorl 

 which does not yet show the furrow on the ventral region. 



Dimensions: 



Diameter 15.2 mm (1) 



Width 4.5 mm 0.30 



Height of the last whorl 8.2 mm 0.54 



Diameter of umbilicus, about 2.5 mm 0.16 



Relation to other species : 



The only species the present one can be compared with is Uddenites 

 minor n. sp., but this latter species is much more evolute. I have been 

 somewhat in doubt if there cire really two different species, because 

 there is the possibility that U. minor represents only inner whorls of 

 U. Sch.uchcrti; but the difference in evolution is so great, especialh in 

 the fragments of both species which are nearest in size, that I have 

 come to the decision to distinguish both forms by different names, 

 especially as the larger specimen of U. minor shows an entirely adult 

 suture. I do not ignore the fact that in some species of Pronorites 

 the larger whorls show a tendency to cover not only the preceding 

 whorls, but also part of the umbilicus; but I have no proof that this 

 is the case in Uddenites, although in U. minor the last whorl covers 

 at least the entire preceding whorl. Later finds will have to decide 

 this question. 



Age: 



Wolfcamp formation; lowermost Permo-Carboniferous. 



Number of specimens examined' 

 Two. 



Locality : 



Immediately northwest of Wolf Camp, Glass Mountains. 



