Permo-Carhoniferous Ammonoids of the Glass Mountains 163 



sipho, diminish in height and the latter one even disappears, while the 

 middle branch of the auxiliary saddle becomes now as high as the 

 external saddle. The two lateral saddles are of equal but much 

 lower height than the external and the first auxiliary. The suture line 

 reaches here clearly the stage of Shwnardites (pi. X, fig. 20). J. 

 P. Smith already presumed, when he established the genus Shumard- 

 ites, that this would prove to be the precursor of the Cyclolobinae, a 

 hypothesis which is confirmed by our find. 



The internal suture (pi. X, fig. 21) of the present species is not 

 entirely known, but the most important part could be uncovered. The 

 antisiphonal lobe is very long and extremely narrow. It is lanceolate 

 in its general outline but has three pairs of secondary saddles of which 

 the upper one is by far the largest, the middle one long and thin, while 

 the lowermost in about one-third of the total depth is only a pair of 

 sharp corners. All lean over toward the median line of the lobe. 

 While the antisiphonal lobe is entirely symmetrical, the first lateral 

 lobe is entirely asymmetrical. It ends in a long and sharp point and 

 the shape and size of the secondary saddles which scallop its sides are 

 entirely different. This lobe is shorter than the foregoing one. The 

 second lateral lobe is also long and ends in a sharp point, but is 

 shorter than the first. Its form is similar in general to that of the 

 first lateral lobe, although the details are different. The first auxiliary 

 lobe also ends in a long point, but is comparatively broader and more 

 asymmetrical than the lateral ones. All the lobes decrease gradually 

 but rapidly in depth from the antisiphonal to the first auxiliary lobe; 

 the number of the auxiliary lobes is unknown. 



The internal saddle is extremely long and slender, and tapers 

 slightly from the base toward the upper end. It ends in a broad 

 phylloid point and has several rounded branches farther down. The 

 secondary lobes which scallop its sides are broad and deep near the 

 upper portion and grow very shallow near the base. The first and 

 second lateral saddles are built on exactly the same plan as the internal 

 saddle, with the one exception that they do not show the same number 

 of branches. Those near the base disappear. The first auxiliary 

 saddle shows exactly the outline of the upper portion of the internal 

 saddle, but all the secondary lobes and secondary saddles of the latter 

 are missing on the auxiliary saddle. The exact number of auxiliary 



