VOL. VIII, PP. 97-108, PLS. XII, XIII JULY 20, 1893 



PROCEEDINGS 



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. Stratigraphic Position of the Caprina Limestone Beds in the 



Comanche Series 97 



II. Characteristic Fossils 100 



III. Age of the Caprina Limestone Beds 104 



IV. Description of Species 105 



V. Plates.. . 108 



I. STRATIGRAPHIC 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 Fredericksburg division (Comanche Peak group 

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

 as the Caprina limestone of Shumard.* 



Dr. Shumard placed the bed in the Upper Cretaceous, at the 

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



* First Annual Import Texas State Geological Survey, Austin, 1880-'S8, 

 pp. 124-12(5. 



14-Bioi.. Sor. WASH., Vor.. VIII, IS'i.",. (97) 



