A New Ammonite Fauna of the Lower Turanian of Mexico 211 



that this species belongs to the group of Pseudaspidoceras Footeanum. 

 White compares his species with Ammonites Leonensis Conrad, which is 

 probably a Schloenbachia, and also with Prionotropis Woolgari. 



We know nothing about the age of the beds where the type of the species 

 has been found but the similarity with Pseudaspidoceras Footeanum allows 

 us to conclude that they probably belong to the Salmurian. In this idea 

 we are confirmed by the circumstance that in the same locality Vascoceras 

 Harttii Hyatt has been discovered. 



Number of specimens : 1. 



Age: Lower Turonian (Salmurian), lower horizon. 



FACES I A Pervinquie're 

 FACES I A HAARMANNI sp. nov. 

 PL 14, figs. 1, 2; PL 15, fig. 2 



In the lower bed of the Salmurian of Cerro del Macho Dr. Haarmann 

 found a not quite complete specimen of so characteristic a Fagesia that I 

 have no hesitation in giving it a new name. Another more complete but 

 somewhat deformed specimen collected by Dr. E. Wittich, was given to me 

 by Mr. Federico Ritter. The features of the larger specimen are : 



Shell moderately involute with whorls of transversally elliptical cross- 

 section, much broader than high. The umbilicus is rather narrow and 

 deep; the umbilical wall is abrupt, in the internal whorls nearly vertical. 

 The ventral portion is broad and slightly convex, the region of the flanks 

 is very narrow and one might say scarcely developed and in reality only 

 represented by the umbilical nodules ; the ventral part nearly touches the 

 umbilical wall. The ornamentation consists on the umbilical border of 

 some nine very strong, pointed and round nodules. From these nodules 

 start rounded, broad, rather high ribs which cross the ventral portion 

 without interruption in a curve directed toward the front; in general 

 a pair of ribs starts from each nodule and one or two more become inter- 

 calated between every two pairs. This disposition can not be observed 

 with entire certainty because the border of the whorl is a little broken. 



The suture could not be made visible. 



Dimensions: 



Diameter 165 mm. (1) 



Height of the last whorl 52 mm. 0.32 



Width of the last whorl ?74 mm. 0.45 



Diameter of the umbilicus 66 mm. 0.40 



