56 University of Texas Bulletin 



*Schloenbachia sp. 

 *Acanthoceras (?) sp. 

 "Turrilites sp. (?) 

 *Baculites (?) sp. 



Ophioglypha texana Clark 

 *Starfish sp. (ray) 

 *Goniophorus (?) sp. 2 specimens, one with the shell. 



Leiocidaris sp. (spine and plate). 



Leiocidaris hemigranosus Shumard. 



Hemiaster sp. (plate). 



Hoploparia sp. 



Cambarus (?) sp. (like sp. in Gainesville brickyards Weno). 



Crabs 9 spp. 



Ostrea quadriplicata Roemer. 



Ostrea carinata Lamarck. 



Gryphea washitaensis Hill. 



Ostrea sp. (small zigzag). 



Stearnsia robbinsi White (?). 



Gervilliopsis invaginata White (?) 



Trigonia emoryi Conrad. 



Plicatula dentonensis (?) Cragin. 

 *Arca sp. 



Anomia sp. 



Plicatula spp. 

 *Nucula sp. 

 *Cardium sp. 

 *Leda sp. 

 *Corbula sp. 



Pecten sp. aff. inconspicuus Cragin. 



Crania sp. 



Dentalium sp. 

 ?Porocystis-like masses. 



*Natica sp. 

 *Cinulia sp. 



Fish teeth, vertebrae, skin, plates. 



GRAYSON FAUNA 



The pyrite and limonite fauna so far discovered in the Grayson forma- 

 tion is confined to the middle clay member of the formation in North 

 Texas, and includes diverse ammonites, gastropods and pelecypods, as 

 listed below. However, the pyrite fauna of the middle Del Rio clay 

 which occurs in McLennan County and southward is of Grayson age, 



