Permo-C arhoniferous Ammonoids of the Glass Mountains 121 



Locality: 



Junction of Road and Gilliam Canyons ; half a mile southeast of the 

 latter point, especially frequent on the hill east of the first locality; 

 mountain north of Leonard Mountain — Glass Mountains. 



Adrianites Gemm. 



Gemmellaro^ created the genus Adrianites for some more or less 

 globose forms with reticulate ornamentation, with broad ventral part, 

 narrow or closed umbilicus, strong constrictions, long body chamber, 

 curved suture composed of numerous claviform or lanceolate lobes, and 

 saddles constricted at the base, the siphonal lobe being divided into two 

 branches by a median saddle. 



Mojsisovics^ and Karpinsky^ tried to show that these forms could 

 not well be separated from Agathiceras, because the general character 

 of the saddles and lobes is the same, although they are much more num- 

 erous in Adrianites. 



Gemmellaro* answered Mojsisovics in the appendix to his work, 

 demonstrating that the internal sutures of both groups were entirely 

 different, Adrianites possessing at least five to six internal saddles 

 while Agathiceras has only two of an entirely different form. 



Karpinsky does not seem to give much importance to these charac- 

 ters, because in an appendix to his work he insists that both groups 

 belong together; but Haug^, J. P. Smith^ Diener'' and Tchernow^ 

 recognized the validity of the genus Adrianites and Smith justly re- 

 marks that Adrianites represents a much higher stage of development 

 than Agathiceras does. 



Among our material Adrianites is very rare, and none of the speci- 

 mens could be prepared in such a manner as to show the nature of the 

 internal suture. But the number and form of the lobes and saddles of 

 the external suture line correspond exactly to those of the typical 



'Gemmellaro, Calc. c. Fusulina, p. 39. 



"Mojsisovics, Arlttische Trias-Amm., p. 19. 



"Karpinslcy, Amm. d. Artinsk-Stufe, p. 63, 84. 



'Gemmellaro, loc. cit., app. p. 23. 



•Haug, Les Amm. d. Perm. et. du Trias, p. 394. 



•J. P. Smith, Carb. Amm. of America, p. 130. 



'Diener, Perm. foss. of the Central Himalayas, p. 117. 



Tchernow, L'fitage d'Artinsk, p. 288, etc. 



