226 



University of Texas Bulletin 



The suture is badly preserved, because all the specimens are corroded 

 on the surface, and rio suture could be made visible on the internal whorls. 

 We note a little ramified external saddle, which is rather broad and low; 

 the first lateral lobe is broad, shallow and ends in three points, those on 

 the umbilical side being longer than the one on the ventral side. Some 

 smaller ramifications exist on the sides of this lobe. The first lateral 



i/^ 

 VJ 



Figure 7. Sutures, Neoptychites aff. xetriformis Pervinquiere (lower left hand corner) 

 and Hoplitoides sp. (other three). 



saddle is broad and relatively high, and a secondary lobe divides it in two 

 parts. The following saddles are much destroyed and no longer show 

 their ramifications. The lobes are much shallower than the first lateral 

 lobe. 



Dimensions : 



Diameter 149 mm. (1) 119 mm. (1) 



Height of the last whorl 76mm. 0.51 58mm. 0.49 



Width of the last whorl 45mm. 0.30 34mm. 0.29 



Diameter of the umbilicus 19 mm. 0.13 18 mm.? 0.15 



Our specimens belong very probably to the genus Hoplitoides and to the 

 bicarinate group of it. Externally they resemble this group in an extra- 

 ordinary manner and especially Hoplitoides mirabilis Pervinquiere. Per- 

 vinquiere has united these forms, which distinguish themselves by a flat 

 venter even in a very advanced stage, with the Hoplitoides of the Emsche- 

 rian, which show a flat venter only in their youth, the venter in the adult 

 age becoming sharp or a little rounded. Only the study of a large and 



