Mesozoic and CcBnozoic Geology and Palceontology. 261 



now Unio tellinoides, Pleurotomaria uniangulata^ CerWiium fremonti, 

 C. tenerum, now Goniobasis tenera^ Natica (?) occidentalts, and Tur- 

 bo paliidinaifo7'mis, now Viviparus paludinoeformis. 



AVilliam Lonsdale* described, from the Miocene of Virginia, Colum- 

 naria sexradiata, Ileteropora tortilis, now 3falticrescis tortilis, Es- 

 chnrina hcmidid a, now Cellepora tumidula^C. quadrangular is,now Bep- 

 tocelleporaria quadrangular is, C. informata, now B. informata, C. 

 similis, now B. similis, C. umbiUcata, now Midtiporina umbilicata. 

 From the Eocene, Ocellaria ramosa, Flabellum cuneiforme, Dendro- 

 phyllia loivis, Cladocera recrescens, CaryopliylUa subdichotoma, Idmo- 

 nea commiscens, I. inaxillaris, Hippothoa tuber culum^ now Pyriflus- 

 trella tuber cula^ Eschar a incumbens, E. petiolus^ E. tubidata, E, 

 viminea, E. linea, now Eschar inella linea, Liinidites distans, L. sex- 

 angulatus,sixi6. L. contiguus. L^^ell and vSowerb}^ described Terebra- 

 tula loUmingtonensis, now Bhynchonella ivdmingtonensis, and Ceri- 

 thium georgiamnn. And Edward Forbes described, Scutella jonesii 

 now Clypeaster jonesi. 



In 1846, Mr. Conradf demonstrated that the white limestone of 

 Southern Alabama and Mississippi, which had been previously classed 

 with the upper Cretaceous rocks, belongs more properly with the 

 lower Eocene, and described Dentalium arciformis, Fistulana larva^ 

 Lidraria lapidosa, now Pteropsis lapidosa, Crassatella rhomboidea, 

 C. palmida, Amphidesma tellinida, Tellina sUUmani, T. raveneli, and 

 Lucina modesta. 



He found evidences of the EoceneJ; and Miocene in East Florida, 

 and described the Tertiary of Warren count}^, Mississippi, and stated, 

 that it marks a distinct era in the American Tertiar}^ s^^stem inter- 

 mediate to the Eocene and Miocene, but more nearlj^ allied to the for- 

 mer. He described the Eocene at Yicksburg, and in the bluffs on the 

 Mississippi river, and defined, from the Upper Eocene limestone of 

 Tampa Ba}', Bullmus jloridanus. Bulla petrosa, Niimmulites flori- 

 danus, Cristellaria rotella, Venus penita, now Cryptogramma penita^ 

 V.Jloridana, now C.floridana, JSrvcida tellinula, Cytherea jloridana, 

 and Balanus humdis. 



Dr. Dickeson§ described, from the blue clay that underlies the dilu- 

 vial drift east of Natchez, Mississippi, a fossil, os innominatum, that 

 once belonged, as he supposed, to a young man about 16 years of age. 



* Quar. Jour. Geo. Soc. Lond., vol. i. 

 t Am. Jour. Sci. and Arts, 2d ser., vol. i. 

 t Am. Jour. Sci. and Arts, 2d ser., vol. ii, 

 § I'ror. Acad. Nat. Sci., vol. iii. 



