54 PROCEEDINGS OP THE ACADEMY OF [1895. 



Genus VOLVTJLA. 

 Volvula? smithvillensis nov. sp. PI. 3, fig. 8. 



Specific characterization. Shell large anteriorly and centrally but 

 attenuated posteriorly; thick; spirally striate near either terminus; 

 columella with one strong fold. 



This shell has somewhat the form of Actwonella. It differs from 

 V. minutissima by its greater thickness, its greatest diameter being 

 located more to the anterior, and by its thick, strong columellar fold. 



Locality. Smith ville, Bastrop Co., Tex. 



Geological horizon. Lower Claiborne Eocene. 



Type. Texas State Museum. 



Genus CYLICHNELLA. 



Cylichnella atysopsis nov. sp. PI. 3, fig. 9, a. 

 "Volvula minutissima" Gabb, specimen in coll. Ac. Nat. Sci. Phila. 



Specific characterization. General form globose as figured; sub- 

 stance of the shell rather thick; spirally striate; columella with one 

 fold; umbilicated. 



Locality. Little Brazos River, near iron bridge, on Mosley's 

 Ferry road. 



Geological horizon. Lower Claiborne Eocene. 



Type. Texas State Museum. Fig. 9a is the so- labelled V. minu- 

 tissima of the Academy collection. 



Genus TEREBRA. 

 Terebra texagyra nov. sp. PI. 3, fig. 10. 



T. polygyra Heilp., Proc. Ac. Nat. Sci. Phila., 1890, p. 398. 



Specific characterization. General form and size as indicated by 

 the figure; whorls about 15; marked as follows : slightly shouldered 

 below the suture; below, two-sevenths of the way to the next suture 

 with a moderately strong spiral stria; ribs about 15 on each whorl, 

 strong above but dying out below, not deflected or dislocated by the 

 subsutural revolving line; columella twisted as shown in the figure. 



Conrad's T. polygyra has a more slender form, with far less 

 prominent plicae. T. divisurum and T. polygyra both show disloca- 

 tion at the subsutural line. T. texagyra resembles T. tantula in 

 some respects, but is less costate and less slender. 



Localities. Between OrrelPs and Evergreen Crossing, on Elm 

 Creek, Lee Co.; near Crockett and 2 miles west of Crockett, 

 Houston Co. 



This is doubtless, in part at least, the species referred to by 



