102 Hill — The Invcrtchrate Fossils of the 



Nerinea subula Roemer. . 

 Glanconia (?). 



Cerithiuvi obllierato-granosum Roemer. 

 Cerithium austinensis Roemer. 

 Trochiis texanus Roemer. 

 Solarium planorhis' Koemei'. 

 Natica (Amauropsis') avellana Roemer. 

 Requienia patagiata Ch. A. ^^'hite. 

 Monopdeura marcida Ch. A. White. 

 Monopdeura phiguiscula Ch. A. ^^'hite. 

 Lucina acute-Uneolata Roemer. 

 Requienia patagiata Ch. A. White. 



The following forms have a more general occurrence : 



Ostrea munsoni sp. nov. 

 Radiolites texana Roemer. 



" davidsoni sp. nov. 

 Requienia texana Roemer. 

 Ichthyosarcolithes anguis Roemer. 

 Monopleura marcida Ch. A. White. 

 Ammonites (Buchiceras) pedernalis von Buch. 



" (ScJdoenbachia) acute-carniatus von Buch. 



In addition to the foregoing numerous species have heen 

 described under the generic name of Caprina, owing to the occur- 

 rence in immense quantities of a fossil supposed to have belonged 

 to that genus. These fossils, however, are usually imperfectly 

 preserved, but it can now be said with assurance that none of 

 them belong to that genus, but are mostly Ichthyosarcolithes or 

 Radiolites. All of the so-called Caprinas heretofore described 

 from Texas come from this horizon. 



Most of the Austin species occur in the bluffs of the south 

 bank of the Colorado and Barton creek, just west of Austin, as 

 beautifully preserved calcite pseud omorphs. Usually the lime- 

 stone is very barren of all fossils except the Rudistes and Chamidx. 



Other aberrant Chamidx and Rudistes from the Texas Creta- 

 ceous have long been known, but their exact stratigraphic range 

 has not been clearly stated. With the exception of Radiolites 

 daridsoni herein described, the stratigraphic occurrence of all the 

 species was unknown to their authors when they described them. 

 Many were described from imperfect specimens, and all the 

 writers previous to Dr. White's valuable contribution expressed 



