756 



NORTH AMERICAN INDEX FOSSILS. 



Fig. Iioo. Pugnellus fusiformis. (After Stanton.) 



CXXXIX. Orthaulax Gabb. 



Spire of smooth whorls, lip simple, extending at each end into 

 a canal; spire mostly enclosed by a deposit of enamel. Eocenic- 

 Miooenic. 



505. 0. gabbi Dall. (Fig. 1101.) Oligocenic-Miocenic. 



Young showing many whorls, lip expanding posteriorly and 



covering spire ; later whorls each with three irregular varices ; 



w 



Fig. 1101. Grthaulax gabbi, about three fourths Fig. 1102. Rhnella laqueata. 

 nat. size. (After Dall. ) (After Conrad. ) 



columellar pillar thick, slightly recurved, canal short, the outer 

 lip somewhat thickened. 



Chipolan and Alum Bluff beds of Gulf States. 



