112 



NORTH AMERICAN INDEX FOSSILS. 



Very slightly umbilicate, with rounded venter and extended axial 

 portion; less rapidly enlarging aperturally than the preceding, and 

 with more pronounced ventral saddles. 



Lower Eocenic of nearly all the Gulf States. 



LV. Aturia Bronn. 

 Differs from Hercoglossa in having large siphuncle close to 



Fig. 1344. Aturia vanuxemi, X Vz- (After Whitfield, Pal. N. J., II. 



dorsum from an early stage, the funnels of which are very long 



(see Fig. 1345). Eocenic and Miocenic. 



145. A. vanuxemi Conrad. (Figs. 1344, 1345.) Eocenic. 



Fig. 1345. Aturia vanuxemi^ filling between two septa, X Yz- 

 (After Whitfield, Pal. N. J., II.) 



