Per mo-Carboniferous Ammonoids of the Glass Mountains 53 



lobe is extremely broad, and somewhat oblique, the bottom being a 

 little nearer to the siphon than the upper part. The bottom is finely 

 serrated. The second lateral lobe is narrow, having only about one- 

 third of the width of the first one. It is curved with the convexity 

 toward the siphonal region, and the bottom is finely serrated. The 

 first and second auxiliary lobes are slightly curved similarly to the 

 preceding one, but seem to be rounded at the bottom and not serrated. 

 The third and fourth auxiliary lobes are very small, straight and less 

 deep than the preceding ones ; the fourth lobe is on the umbilical bor- 

 der. All the lobes from the second lateral to the fourth auxiliary are 

 a little oblique, the upper part being somewhat nearer to the siphonal 

 region than the bottom. All the saddles are entire and rounded at 

 the top. The external saddle is moderately high and much constricted 

 a little below the middle. The first lateral saddle is much higher than 

 the external, constricted above the base, but much less than the pre- 

 ceding one. The second lateral saddle is only about half as high as 

 the first, and constricted above the base. The first auxiliary saddle 

 has only about two-thirds of the height of the preceding one and is 

 constricted above the base. From the first to the fourth auxiliary 

 saddle, the height decreases steadily, the second and perhaps even 

 the third show very slight constriction above the base. The fourth, 

 which lies on the umbilical wall, is of a very simple form, broader be- 

 low than above, and rounded at the top. 



The internal suture (pi. I, fig. 8) could only be observed in the 

 whorl preceding the outer one on which the external suture appears 

 as described above. This inner whorl shows only five external lateral 

 lobes and five saddles. The internal suture shows a rather deep, lance- 

 olate antisiphonal lobe, the lower part of which touches the inner walls 

 of the internal saddles belonging to the next smaller septum. The 

 first lateral lobe it not quite as deep as the antisiphonal one, slightly 

 curved with the convexity toward the antisiphonal region, and rounded 

 at the bottom. A second and very small lobe lies on the umbilical seam 

 so that one of its flanks belongs to the internal, the other to the ex- 

 high and slender, rounded at the top, but not constricted. The first 

 ternal suture. It is only a slight indentation. I'he internal saddle is 

 lateral saddle is somewhat tongue-shaped, oblique and very small. 



