Permo-Carhoniferous Ammonoids of the Glass Mountains 195 



sharp keels, which are not beaded at all, and are separated by a mod- 

 erately wide and deep spiral furrow. The umbilicus is not preserved 

 in any of our specimens. No ornamentation is visible on the casts. 



The suture is in general very similar to that of Medlicottia n. sp. II, 

 but shows also some very characteristic differences. The septa are 

 very near each other, the ends of the saddles touching the base of 

 those of the next younger line. The suture follows a slightly curved 

 line, a very characteristic feature of it being that the lobes become 

 very shallow from the second auxiliary lobe, although this feature is 

 not quite so pronounced as in Medlicottia n. sp. II. 



The siphonal lobe is long and narrow and clearly bifid, the small 

 median saddle is relatively high, pointed, and narrow; the lobe 

 reaches down to about the height of the small rudimentary saddle 

 which divides the adventive lobe "A" on the umbilical flank of EBi 

 into two parts. The first lateral lobe is less deep than the second 

 lateral one. It has an extremely characteristic form. A club-shaped, 

 high, narrow, secondary saddle, constricted near its base, divides it 

 in two branches of which the one nearest to the venter is considerably 

 longer and more strongly curved than the one nearer to the umbilicus ; 

 this latter one is again divided into two branches by a short, stout, tri- 

 angular saddle, a complication which as yet never has been observed 

 in another species of this genus. In both of our specimens, this bifid 

 branch is clearly visible. The second lateral lobe is deeper than all 

 the rest of the lobes ; it is bifid, the branch nearer to the venter being a 

 little broader than the one nearer to the umbilicus ; in depth they are 

 scarcely dififerent. The first auxiliary lobe is very similar to the sec- 

 ond lateral one, but the branch nearer to the umbilicus is a little longer 

 than the one toward the venter. On the specimens we possess only five 

 auxiliary lobes are preserved; all of them are bifid and the branch 

 nearer the umbilicus is alwaye longer than the one nearer the venter, 

 but the difference is small. The auxiliary lobes are much shallower 

 than the two labral ones and toward the umbilicus decrease uniformly 

 in depth. How large the number of auxiliary lobes really is in this 

 ' species cannot be determined with our material, but the number must 

 be rather large. 



The external saddle is very high and relatively broad; a deep and 

 bifid adventive lobe "A" divides it into two unequal parts. The 



