M. T. Hill — Texas Section of American Cretaceous. 295 



Ostrea bellaplicata Shum. 

 Ostrea Blackii White. 

 Spondylus guadalnpce Room. 

 Lima crenulicosta Roem. 

 Pecten burlingtonensis Shum. 

 Pecten Nilssoni Goldf., Roem. 

 Pecten simplicus Shum. 

 Pecten virgatus Nills, Roem. 

 Area vulgaris. 

 Area sublongata Con. 

 Trigonia thoracia Mort. 

 Cardita eminula Con. 

 Lucina parvedineata Shum. 

 Cardium congestion Con. 

 Cardium choctaicense Shum. 

 Liopistha elegantida Roem. 

 Pachy cardium Spillmani. 

 Cy there a. 

 Line a r i a cancellato-scidpta 



Roem. 

 Mactra texana Con. 

 Mactra cdta M. and H. 

 Mytilus semiplicatus Roem. 

 Anatina sulcatina Shum. 

 Panopcpxi subplicata Shum. 

 Pholadomya Lincecumi Shum. 

 Pholadomya tippana. 

 Inoceramus Mort. 

 Inoceramus confertim-annula- 



tus Roem. 

 Inoceramus crispii Mant. 

 Inoceramus crispii Mant.; var. 



sulcatina Whitfield. 

 Inoceramus striatus Mant.,R'm. 

 Inoceramus biformis. 

 Avicula planiuscula Roem. 

 Legumen elliptica. 

 Siliquaria biplicata. 

 Radiolites austinensis Roem. 



* Cylichna secalina Shum. 



* Cylichna striatella Shum. 

 Anisomyon Haydeni Shum. 

 Turritella corsicana Shum. 

 Tarritella irrorata Con. 

 Turritella Winchelli Shum. 

 Eidima ? texana Roem. 

 Scala bicarinifera Shum. 

 Scalaria Forsheyi Shum. 

 Chemnitza f texana Roem. 

 Ficus subdensatus. 

 Pleurotoma ripleyana. 

 Pyrula, sp. ind. 



Rapa supraplicata. 

 Purpurea cancellaria. 

 Solidula Riddelli Shum. 

 Strombus densatus. 

 Chemnitza gloriosa Roem. 

 Volutithes? navarroensis Shum. 

 Rostellites texanus Con. 

 *Ringicnla pulchella Shum. 

 Nautilus elegaus Sow., Roem. 

 Nautilus Pekayi. 

 Baculites anceps Lamck. 

 Baculites annulatus Con. 

 Baculites asper Mort., Roem. 

 Baculites spillmani. 

 Baculites tippaensis. 

 Turrilites splendidus Shum. 

 Turrilites helicinus Shum. 

 Scophites verrucosus Shum. 

 Helicoceras navarroensis Shum. 

 * Ptychoceras texanus Shum. 



* Ammonites dentato-cur hiatus 



Roem. 

 Ammonites flaccidicosta Roem. 

 Ammonites guadalupm Roem. 

 Ammonites pleurisepta Con. 



* Ammonites texana? Roem. 



* Fossils marked thus are doubtfully placed here. 



, A careful comparison of the above list, which is mostly in 

 the nomenclature of the original descriptions, with similar lists 

 published by different authors from jSTew Jersey, Alabama 

 and Mississippi, and the Rocky Mountain region, shows that 

 nearly a third of the forms can be reduced to synonyms and 

 that fully three-fourths of the species are common to the Upper 

 Cretaceous of these regions, and that the faunal cessation at its 

 base is as clearly marked. The writer does not believe in gen- 

 eral correlations, but Mr. Meek has clearly shown the con- 



