104 Hill The Invertebrate Fossils of tJie 



limestone, was referred to the genus Hip pu rites by Roemer,* 

 although upon reading his description as originally published 

 it will be seen that he distinctly stated that it was exceedingly 

 doubtful whether this form belonged to Radiolites or Hippurites. 

 The name Hippurites, however, has gone forth in literature, and, 

 inasmuch as this genus is a characteristic form of the Upper 

 Cretaceous of Europe, its supposed occurrence in the Lower 

 Cretaceous of Texas has been the greatest obstacle to man in 

 accepting the lower position of the Comanche Series. I am now 

 prepared to state that there is not a single Hippurites '[ in either 

 the Lower or Upper Cretaceous of Texas, and that this unfortu- 

 nate impression should no longer prevail. 



III. AGE OF THE CAPRINA LIMESTONE. 



The writer does not feel prepared to separate the Caprina 

 limestone from the remainder of the Fredericksburg Division 

 as a unit for the discussion of homotaxy, and in the following 

 remarks it should be remembered that the beds are stratigraph- 

 ically related. 



Dr. Fred. Roemer, in his classical monograph of the Kreidebil- 

 dungen von Texas, placed the beds which are now known to be 

 the Caprina limestone at the very top of the Texas Cretaceous 

 and referred them to the Senonien. Forty years later he un- 

 knowingly described more of the fauna from the same beds and 

 placed them in the Turonien.J In earlier writings I have 

 shown the erroneous impression under which Dr. Roemer thus 

 placed these beds, and that instead of occurring above his Tu- 

 ronien (Austin chalk beds) they are stratigraphically below 

 them, and hence could not be Senonien. 



Shumard, who first denned and applied the present name to 

 the beds whose fossils had been described in part by Roemer, 

 also failed to discover the true stratigraphic position, and like- 

 wise placed them at the top of the Texas Cretaceous. || 



* Kreide, von Texas, p. 76. 



fin the Third Annual Report of the Texas Geological Survey a species 

 is mentioned by name only &9 " Hippurties flabettata np. nov." from the 

 Caprina limestone. No description whatever lias been given of this 

 form. From the writer's familiarity with the specimens in the Texas 

 collection lie thinks it probable that it must be a Radiolites. 



t Paleontologischc Abhandlungeh. 



$ Am. Journ. Sci., vol. \\.\vir, 1889, pp. 318-.'{1<). Ibid, April, IS!):;. 



|| Loc. cit. 



