Permo-Carboniferous Ammonoids of the Glass Mountains lot 



Dimensions: 



I II 



Diameter 13.3 mm (1) 6.8 mm (1) 



Width 13.0 0.98 7.2 1.06 



Height of last whorl 6.7 0.50 3.1 0.46 



Diameter of umbilicus 1.7 0.13 0.7 0.10 



Relation to other species: 



We have already remarked in our discussion of Paralegoceras that 

 the generic position of the present species is not quite certain. For 

 Gastrioceras as well as for Paralegoceras, the form is too involute, but 

 the suture evidently places it in one of the two genera. I do not know 

 any species which could be compared with the present one. 



Age: 



Wolfcamp formation, Permo-Carboniferous. 



Number of specimens examined: 



Three. The species seems to be very rare at the locality; it is not 

 quite certain that the third specimen belongs to it. 



Locality: 



Immediately northwest of Wolf Camp, Glass Mountains. 



