Per mo -Carboniferous Ammonoids of the Glass Mountains 153 



The septa are well separated and never touch each other. The 

 sutural line (pi. VII, fig. 65, 67, 72, 73) inclines from the umbilicus 

 backward toward the siphonal region. All the saddles are entire, 

 rounded at the top, high, slender and the first three are constricted 

 hear their base. The lobes are much broader than the saddles. The 

 siphonal lobe is divided in two branches by a median saddle. Each 

 of the branches is asymmetrical and ends in one point which is near 

 the inner side ; on the outer side the bottom of the lobe bulges sUghtly 

 and thus shows a tendency to form a second and shorter point. The 

 first lateral lobe is nearly symmetrical and bifid; the second lateral 

 lobe is decidedly asymmetrical and bifid, the outer point being much 

 longer than the inner one. The first auxiliary lobe is asymmetrical 

 and trifid, the middle and the outer point being of equal length while 

 the inner one is much shorter than either of the others. A second 

 auxiliary lobe is very shallow, funnel-shaped, and ends in one point. 

 A third seems to exist on the umbilical wall; its exact figure could 

 not be clearly seen, but it appears to be deeper than the second, to be 

 funnel-shaped and to end in a sharp point. The first and second 

 lateral lobes seem to be of nearly the same width, while the first auxil- 

 iary is broader. The depth of these three lobes decreases gradually. 



The median saddle of the siphonal lobe is relatively high and slen- 

 der; it is slightly notched at the top by a shallow indentation. The 

 external saddle is very high and slender, and well constricted a little 

 below the middle. The first lateral saddle is a little lower and less 

 constricted, while the second is somewhat asymmetrical. The. first 

 auxiliary saddle is very broad, low and asymmetrical, while the second 

 auxiliary is still lower, relatively broad and yet more asymmetrical. 

 The internal sutures of the species are unknown. 



Dimensions : 



Diameter 19.7 mm (1) 



Greatest width ' 16.5 0.84 



Height of last whorl 9.4 0.48 



Diameter of umbilicus 1.9 0.10 



Relation to other species: 



The present species cannot very well be compared with any of those 

 belonging to Marathonites on account of its suture line. It resembles 

 more our Vidrioceras Uddeni n. sp., but the outer form is somewhat 



