50 PROCEEDINGS OF THE ACADEMY OF [1895. 



5 miles west of Crockett, Houston Co. ; Hurricane Bayou, Marster's 

 and Hodge's Survey, Houston Co. ; Baptizing Creek, Cherokee Co. 



Geological horizon. — Lower Claiborne Eocene. 



Type. — Singley's collection, from Lee Co. 

 Crassatella texana Heilp. PI. 2, fig. 1. 



C. texana Heilp., Proc. Ac. Nat. Sci. Phila.. 1890, p. 406, pi. xi, f. 6. 



This is certainly very distinct from antestriata. Besides the points 

 of difference mentioned by Heilprin the following may be noted : The 

 umbonal ridge is much sharper in texana, and there is a trace of a 

 sinus just below it ; the posterior margin is not sub-biangular as in 

 antedi iata, and the valves are less oblique. 



From trapaquara this species can be distinguished by its surface 

 markings, lower form, and the depression just below its umbonal 

 ridge. 



Localities. — Near McBee's School-house, 2 miles east of Alto ; 

 Berryman's Land, Kimble Headright, Cherokee Co.; Murchison's 

 Headright ; Lively's Place, Wilson Headright, Houston Co., Tex. 



Geological horizon. — Lower Claiborne Eocene. 



Type. — Apparently lost. 



Genus SPHJERELLA. 

 SphffirellaC?) anteproducta nov. sp. PI. 2, fig. 4. 



Specific characterization. — Size and general form as indicated by 

 the figure ; anterior somewhat produced, laterally compressed ; pos- 

 terior dorsal margin likewise somewhat compressed ; ventricose. 



This species is much more ventricose than infiata Lea, from 

 Claiborne, and scarcely as much so as turgida Con., from the Vicks- 

 burg beds. The umbones are intermediate in size between infiata 

 and turgidula, the size greater than either. 



Localities. — Cedar Creek, Wheelock League, Robertson Co.; 

 cutting on Tyler and South Eastern R. R., 400 yards south of mile 

 post No. 23, Cherokee Co. ; Dr. Collard's Farm, Sparks Headright, 

 Brazos Co.; Elm Creek, Lee Co., Tex. Also from mouth of Saline 

 Bayou, Red River, Louisiana. 



Geological horizon. — Lower Claiborne Eocene. 



Type. — Singley's collection. 



Genus MERETRIX. 

 Meretrix texacola nov. sp. PI. 2,. fig. 5, a, 1). 



Specific characterization. — Size and general forms as indicated by 

 the figures; surface generally smooth about the umbones, but often 



