Vol. VIII, pp. 97-108, pls. XII, XIII July 20, 1893 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON. 



THE PALEONTOLOGY OF THE CRETACEOUS FORMA- 

 TIONS OF TEXAS. 



THE INVERTEBRATE FOSSILS OF THE CAPRINA 

 LIMESTONE BEDS. 



BY ROBERT T. HILL. 



Contents. 



Page. 

 I. — Stmtigraphic Position of the Caprina Limestone Beds in the 



Comanche Series 97 



IL — Characteristic Fossils 100 



III. — Age of the Caprina Limestone Beds 104 



IV. — Description of Species 10-5 



v.— Plates 108 



I. — Str.\tigraphic Position of the Caprina Limestone Beds 

 IN the Comanche Series. 



About midway in the column composing the Comanche series 

 or Lower Cretaceous of Texas, and constituting the uppermost 

 member of the Fredericlcsburg division (Comanche Peak group 

 of Shumard in part), there is a peculiar group of strata known 

 as the Ca])rina limestone of Shumard.* 



Dr. Shumard placed the })ed in the Upper Cretaceous, at the 

 very top of the whole of the fifteen or more subdivisions of the 



■■■" First Annual Report Texas State Geological Survey, Austin, 1880-'SS, 

 PI). 124-12G. 



14-Bioi.. Si.r. Wash., Vol,. VI IL 189.-?. (97) 



