Permo-Carboniferous Ammonoids of the Glass Mountains 189 



In the description of the lobes we have not paid much attention to 

 their ramifications, but in the discussion of the saddles, we shall indi- 

 cate the form and number of the secondary saddles, and thus implicitly 

 show the number and form of the secondary lobes not mentioned in 

 the description given above. 



The external saddle is very high, broad at the base and tapering 

 toward the upper end. The rest of the saddles on the flank have the 

 same form. The external saddle ends in a somewhat oblique phyllum, 

 and it sends further out, at different heights and in alternating posi- 

 tions on both its flanks, three phylloidal branches or secondary saddles, 

 which are separated by deep and asymmetrical secondary lobes ending 

 in a rounded point; at the base of the saddle we see in different height 

 at each side, a small, non-phylloidal branch. Of the phylloidal 

 branches, one is directed toward the siphonal side, and two toward 

 the umbilical side. The first lateral saddle is quite analogous in form 

 to the external one and shows the same number of branches, but it is 

 lower and narrower and the terminal phyllum is not quite so oblique. 

 In general we must say that the height of the saddles decreases slowly 

 from the external saddle to the last auxiliary saddle near the umbilical 

 border. The second lateral saddle is also similar to the first one, but 

 here one of the branches on the umbilical side is missing, and the 

 terminal phyllum is still less oblique. Much more simple is the first 

 auxiliary saddle; it also ends in a very little oblique phyllum, but on 

 the ventral side, only one non-phylloid branch exists, while on the um- 

 bilical side no real branch develops, although a rounded secondary 

 saddle is indicated between two rounded notches at the base. On the 

 contrary, the following second auxiliary saddle shows a very broad 

 terminal phyllum, a short branch on the ventral side and a longer one 

 on the umbilical side. The third auxiliary saddle is quite analogous 

 to the second one, only much lower and narrower; the phyllum is on 

 the umbilical border, the ventral branch is on the flank and the um- 

 bilical one on the umbilical wall. The fourth auxiliary saddle is of a 

 very simple form, asymmetrically triangular, terminating in a rounded 

 point with the steeper flank toward the umbilical border and the less 

 steep one toward the umbilical seam. 



This Perrinites is similar to P. Cxunminsi White, especially with 

 respect to the general form and the number of the branches of the 



