1895.] natural Sciences of Philadelphia. 53 



Localities. — Smithville, Bastrop Co. ; Burleson Shell Bluff on 

 Brazos River; 2 miles east of Alto, Cherokee Co. ; Mosley's Ferry, 

 Brazos River ; Cedar Creek, Wheelock League, Rohertson Co. ; Elm 

 Creek, Rohertson Co.; Berryiuau's Land, Cherokee Co. ; Alum Bluff, 

 Trinity River, Houston Co. ; 2 miles south of Mt. Selmon R O., 

 Cherokee Co.; 1 mile south from Nevilles, Gonzales Co. ; 15 miles 

 southeast of Nacogdoches, Nacogdoches Co., Tex. Also near Enter- 

 prise, Miss. 



Geological horizon of the variety. — Lower Claiborne Eocene. 



Type. — Texas State Museum. 



Genus MARTESIA. 

 Martesia texana nov. sp. PL 3, fig 6. 



Specific characterization. — General form as figured ; surface marked 

 by concentric lines or corrugations crossed by a radiating fold ; ante- 

 rior to this the lines are strong, but behind it they are very faint. 



This species differs from 31. elongata Aid., by its much greater 

 anterior development, and hence the much more central position of 

 the radiating fold. 



Locality. — Two miles east of Alto, Cherokee Co., Tex. 



Geological horizon. — Lower Claiborne Eocene. 



Type specimen. — Texas State Museum. 



GASTROPODA. 



Genus RINGICULA. 

 Ringicula trapaquara nov. sp. PL 3, fig. 7. 



Specific characterization. — Whorls 5; whorls 1, 2, and 3 nearly or 

 quite smooth; 4 with a well marked subsutural line and fainter ones 

 over the whole surface; body whorl strongly striate spirally, labrum 

 very much thickened and crenulate within, labial callosity very pro- 

 nounced, the two labial plica? strong and ascending rapidly upon the 

 body whorl. 



This species differs from R. biplicata Lea by its more numerous 

 spiral striae, its greater oral callosities, and the obliquity and strength 

 of the columellar plica?. R. mississippiensis Con. has plications some- 

 what similar to those of this species, but in other respects it is nearly 

 like R. biplicata. 



Localities. — San Antonio Ferry, Brazos River, Burleson Co. ; 

 between Orrell's and Evergreen Crossing, Elm Creek, Lee Co., Tex. 



Geological horizon. — Lower Claiborne Eocene. 



Type. — Texas State Museum. 



