Pernio -Carboniferous Ammonoids of the Glass Mountains 145 



asymmetrical, the inner point being much longer than the outer one. 

 The first lateral lobe is also bifid but the outer point is very little longer 

 than the inner one. The second lateral lobe is trifid, the middle point 

 being much more prominent than the two lateral ones. The first aux- 

 ilary lobe is again bifid, the two points being nearly of the same length. 

 The second auxiliary lobe is funnel-shaped and ends in a single point. 

 The third auxiliary lobe, which lies on the umbilical wall, is also funnel- 

 shaped and ends in a single point. The two lateral and the first aux- 

 iliary lobes are much narrower than the siphonal one and not much 

 broader than each of the branches of the latter one ; they are more or 

 less of the same width, but decrease slightly in depth from the first to 

 the third. 



The siphonal saddle is relatively high, slender, a little constricted 

 near the middle and notched at the top by an indentation. The exter- 

 nal and the two lateral saddles resemble each other very much ; they are 

 high, slender and constricted near the base. The first auxiliary saddle 

 is a little broader and not constricted. The second auxiliary, which lies 

 on the umbilical shoulder, is as high as the first, but somewhat asym- 

 metrical and broader. The internal suture is unknown. 



Dimensions: 



Diameter 12.0 mm (1) 



Width 10.3 0.86 



Height of last whorl 5.0 0.42 



Diameter of umbilicus 3.0 0.25 



Relation to other species: 



The present species is dififerent from all the other ones that have 

 been found in the Glass Mountains. It distinguishes itself through 

 its first lateral lobe, which is bifid instead of trifid. This character 

 gives it a certain similarity to the ammonoid described by Karpinsky^ 

 as Popanoceras sp. indet. (cfr. Parkeri Heilpr.) This species has 

 also a bifid first lateral lobe, while the second one is trifid but unfor- 

 tunately, the first auxiliary is not well known, although Karpinsky 

 says that it seems to resemble the second lateral. This would distin- 

 guish it from our species where the first auxiliary lobe is bifid. 



Our species is certainly dififerent from Stacheoceras Parkeri Heilpr.,^ 



^Karpinsky, Ammoneen d. Artinsk-Stufe, p. 75, pi. 5, fig. 5, a-c. 

 'Heilprln, Proc. Acad. Nat. Sci. Phila., 1884, p. 53, fig. 1, 2. 



