Permo-Carboniferous Ammonoids of the Glass Mountains 179 



the branches ends in a point. The first lateral lobe is large, funnel- 

 shaped, and apparently rounded; the second lateral lobe is similar to 

 the first one, but at the outer side limited by a much lower saddle. A 

 third and much more shallow lobe must exist right on the umbilical 

 seam. The first two lateral lobes are much deeper than the siphonal 

 one. The saddles are all entire and tongue-shaped. The median 

 saddle of the siphonal lobe is less than half as high as the first lateral, 

 is broad at the base, tapering toward the top, which is notched by an 

 indentation. Unfortunately, this part of the suture is not very well 

 preserved. The external and the first lateral saddle are high and 

 nearly of the same size and shape. The third saddle is about half as 

 high as the first two, but is not very well preserved. 



Dimensions : 



Relation to other species: 



There is no species described which could be well compared with the 

 present one. The form of this ammonoid is rather similar to that of 

 Paraceltites but the characteristic ornamentation of the latter is lack- 

 ing, and the suture seems to be entirely different, especially the siphonal 

 lobe. 



The generic determination remains somewhat doubtful, but better 

 preserved specimens may be found later and allow a better drawing 

 of the sutural line. 



We have already indicated that our species has some similarity with 

 P. Arnoldi Hyatt a. Smith, and that the lobe at the umbilical seam may 

 in reality be the first lateral lobe of the internal suture, becoming visi- 

 ble beyond the seam on account of the narrowness of the dorsal por- 

 tion. As long as we do not know the internal suture of our species, it 

 is impossible to prove that our interpretation is right, but there exists 

 certainly a great resemblance between the suture of our species and that 

 of the form from the Lower Triassic of Idaho. Even the external 

 shape is very similar, especially when we compare our specimens with 

 the mature form illustrated by Hyatt and Smith on their pi. yy, fig. 



