104 IIlU~The rnvertchrntc Fossils of the 



limestone, was referred to the genus Hippurites hy 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 BddioUte-s or Hipimrite>^. 

 The name Hippuriles, 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 Hippuriles'\ in cither 

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

 nate impression should no longer prevail. 



III. — Age of the Caprina Limestone. 



The writer does not feel prepared to separate the Caprina J 

 limestone from tlie remainder of the Fredericksburg Division 

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

 remarks it should hQ remembered that the l^eds are stratigraijh- 

 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 Cretaceoug 

 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 thua 

 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 defined 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- 

 Avise placed them at tlie top of the Texas Cretaceous. || 



* Kreide, von Texas, p. 76. 



t In the Third Annual Report of the Texas (leological Survey a species 

 is mentioned by name only i\s" Jlippurifcs flubeUata sp. nov." from the 

 Caprina limestone. No description whatever has been given of this 

 form. From tlie writer's familiarily with the specimens in the Texas 

 collection he thinks it probable that it nmst l)e a Radiolites. 



X Paleontologische abhandhnigen. 



<; Am. .lourn. Sci., vol. wxvii, ISSi), ])p. .•JIS-.'JT.). Il)i(l, April, 1S<).']. 



II Loc. cit. 



