Permo-Carboniferous Ammonoids of the Glass Mountains 175 



than that of any other species ; the external suture resembles that of our 

 species also, somewhat, although the saddles are more scalloped and 

 more slender, but the external shape of the Sicilian species is entirely 

 different from that of W. Dieneri n. sp. 



W. Stachei Gemm.^ is similar to our species in its external shape, 

 although not quite identical with regard to the ratio of dimensions, and 

 also the sutures are somewhat similar ; but the saddles are more scal- 

 loped and their side branches are longer and the whole saddle 

 straighter; the external saddles are much more curved than in our 

 species. 



A real Waagenoceras has probably been described from the Guada- 

 lupian of Texas. I refer to W. Cvunminsi var. Giiadalupensis Girty,^ 

 but of the different specimens figured, only one can be referred to 

 Waagenoceras with any degree of certainty. This specimen shows 

 part of the internal suture, especially the antisiphonal lobe and the 

 internal saddle. The antisiphonal lobe differs from that of our species, 

 because the lateral branches are nearly as long as the median branch, 

 while in our species these are much shorter. The internal saddle 

 seems to be much stouter than in our forms, while the first lateral 

 saddle has apparently the same shape as that of W. Dieneri. The gen- 

 eric determination of the other specimens figured by Girty is uncertain. 

 Figure 23 may represent a Waagenoceras, but the sutures, fig. 24 and 

 250, are very different from each other. Figure 25a has a very uncom- 

 mon siphonal lobe and apparently a very low median saddle, while 

 Fig. 24 shows a very uncommon position of the suture, although the 

 siphonal lobe seems to be similar to that of Waagenoceras. None of 

 the specimens reproduced by Girty has anything to do with the so-called 

 Waagenoceras Cumminsi White, which, as we have shown, belongs to 

 our new genus Perrinites. W. Dieneri is a very common species in the 

 higher part of our Permo-Carboniferous, the Word formation, but it 

 is difficult to separate it from the rock. 



Age: 



Word formation, Permo-Carboniferous. 



'Gemmellaro, Calc. c. Fusulina, pi. 1, fig. 4-6; pi. 2, fig. 3-4; pi. 4, fig. 1; App., 

 pi. A, fig. 6. 



^Girty, Guadalupian fauna, p. 502, pi. 29, fig. 26 (not fig. 23-25). 



