68 Cretaceous. 



rado, at the foot of Mt. Bonnell. 8. The Arenaceous Group and fish 

 bed, having a thickness of 80 feet, and consisting of light yellow and 

 blue sandstone, and beds of sandy claj', with crystals of selenite and 

 some lignite. This is supposed to be the same as B, C and D of the 

 Pyramid Mount Section of Prof. Marcou, and b}* him referred to the 

 Jurassic period, and to be equivalent to No. 1 of the Nebraska Sec- 

 tion. 9. Marly Clay or Red Rivei- Group, having a thickness of 150 

 feet, and supposed to represent the lower part of the Pj^ramid Mt. Sec- 

 tion, which Prof. Marcou referred to the Trias. 



He described Nautihis texanus, Aminonites inaequiplicatus, A. 

 swallovi, A. 7neekanus. A. graysonensis, A. brazoensis, Scaphites ver- 

 miculus, Ancyloceras (mnulatum^ Baculites (jracilis, Cerithium hos- 

 quense, Phasianella perovata. Avellana texana^ Natica acutispira, 

 Neritopsis biangulatus, Venus suhlamellosus, Gardium choctawense, 

 now Protocardia choctawensis^ C. coloradoense, C. hrazoense, now 

 Protocardia brazoensis, Cytherea lamarensis, now Dione lamarensis, 

 Tapes hilgardi, Area proutana, Lucina sublenticular is, JSfucula hay- 

 deni^ N. serrata, Corbula graysonensis, C. tuomeyi, Pachymya austin- 

 ensis, Panopcea neioberryi., P. siibparallela, Inoceramus capiilus, Ger- 

 vilUa gregaria.^ Janira wrighti, Ostrea bellipUcata, 0. quadriplicata, 

 Cidaris hemigranosus. 



Wm. M. Gabb* described, from Prairie Bluff, Alabama, Ghemnit- 

 zia meekana^ Straparollus subplanus, Sconsia alabamensis, Gancellaria 

 alabamensis, now Turblnopsis alabamensis, and Bulla macrostoma; 

 from the marl of New Jersey, Actoionia naticoides, now Ginulia nati- 

 coides, Phasianella punctata, Volutllithes biplicata, now Rostellites 

 biplicatus, V. bella, now R. bellus, V. 7iasuta, now R. nasutus, V. con- 

 radi. now R. conradl, Fusus retifer, Rapa elevata, Iforea naticella, 

 Bulla recta, Mysia gibbosa, Dione delaioarensis, Grassatella delawar- 

 ensis, G. monmouthensis, Gardita subquadrata, Leda pinniformis, 

 now Nuculana pinniformis., L. protexta, now A", protexta, Gultellus 

 cretaceus^ Pecten biirlingtonensis ; from Tennessee, VolutiUthes 

 saffordi, and Gardium abruptum; from New Jersey-, Actceonina bipli- 

 cata, now SoUdula biplicata, Solarium abyssinus, now Jlargaritella, 

 abyssinus, Volutllithes abbotti, Turbinella subconica, T. parva, Gan- 

 cellaria septemlirata, Purpuroidea dubia, Fusus trivolvis, Rapa 

 pyruloidea^ Pleurotoma niullicaensis, Area quindecemradiata, Gibota 

 multiradiata, and Leda angulata, now JSTuculana angulata, Besma- 

 tocium trilobatum^ and from Eufala, Alabama, Gassidulus micro- 

 coccus. 



■■■• Jour. Acad. Nat. Sci. 2d. Ser., vol. 4. 



