P ermo-C arboniferous Ammonoids of the Glass Mountains 6i 



what pointed, narrower at the top than below the middle. The 

 first auxiliary lobe is asymmetrical, pointed, curved with the 

 convexity toward the ventral side. The second and third auxiliary 

 lobes are again symmetrical, pointed, narrower in the upper part than 

 below the middle. The fourth and fifth auxiliary lobes are symme- 

 trical, pointed, but about equally wide in their upper half. The fifth 

 lobe lies near the umbilical border and there follow still two more 

 lobes on the umbilical border and wall. The sixth is similar to the 

 fifth, but smaller; while the seventh is extremely small and not more 

 than a slight indentation. 



The saddles are all entire, and rounded at the top, but they diflfer in 

 height. The external saddle is moderately high and leans over toward 

 the sipho; it is constricted. The lateral and auxiliary saddles are 

 of equal shape, rounded at the top and more or less constricted above 

 the base. The first and second lateral saddles are of equal length 

 and higher than the external and the rest of the saddles on the flank; 

 they are also similar in shape and width. The first auxiliary saddle 

 is considerably shorter than the two preceding ones. From the first 

 to the fifth auxiliary (on the umbilical shoulder) the saddles decrease 

 in length and width, but have more or less the same shape. A sixth 

 and seventh which lie on the umbilical wall reach with their top to the 

 prolongation of the line formed bv the upper ends of the preceaing 

 saddles, but their base is much higher than that of the saddles on the 

 flank. 



The seventh auxiliary saddle reaches with its flank over to the in- 

 ternal suture. This (pi. I, fig. 23) consists of a very deep antisiphonal 

 lobe of lanceolate form, much narrower at the top than below the 

 middle. Its bottom reaches far down and touches the upper and inner 

 sides of the internal saddles of the next suture. The first lateral lobe 

 is not quite half as long as the antisiphonal one; it is slightly asym- 

 metrical and somewhat curved with the convexity toward the anti 

 siphonal side. There follows a second and quite insignificant lateral 

 lobe, the top of which is about as high as that of the first lobe, but its 

 depth is only 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 convexity toward the antisiphonal region, and 

 a little constricted. The first lateral saddle is very small and narrow, 



