58 University of Texas Bulletin 



PELECYPODS: 



Gryphea mucronata Gabb. 



Gryphea sp. aff. corrugata Say. 



Exogyra sp. aff. columbae Sowerby (L). 



Exogyra n. sp. (Denison, M). 



Exogyra sp. aff. texana (U, under Buda limestone, Bosque River, W of Waco). 



Pecten texanus Roemer. 



Pecten subalpinus Bose. 

 *Arca sp. 



Ostrea sp. aff. subovata Shumard. 



Lima sp. (elongate). 



Lima sp. (quadrate). 



Lima sp. aff. wacoensis Roemer. 



Ostrea sp. (saucer). 



Anomia sp. 



Plicatula spp. 



Protocardia texana (?) Conrad. 



Pholadomya shattucki Bose. 



Tapes sp. 



Inoceramus sp. M. 



Corbula (?) sp. 



Trigonia sp. 



Cyprimeria sp. (small). 



Cyprimeria sp. aff. crassa Meek. 

 *Nucula sp. 



*Crassatella (?) sp. ("Remondia"). 

 *Barbatia sp. 



Trigonia sp. (large). 

 *Isocardia sp. 



Shark teeth, vertebrae, bones. 



DEL RIO CLAY FAUNA 



The Del Rio limonite fauna is very widespread in Texas, having been 

 found at Waco, South Bosque, Austin, Quihi (Medina County), Del Rio, 

 Terlingua, and the Solitario. 



In McLennan County at the base of the Del Rio clay, which corresponds 

 to the middle of the Mainstreet limestone, an extensive pyrite and limonite 

 fauna occurs, including the following: 



*Exogyra arietina Roemer. 

 *Turritella sp. 

 *Cerithium sp. 

 *Turrilites spp. 

 *Schloenbachia sp. 



