3Iesozoic and Ccenozoic Geology and PalcBontology . 177 



ascending order, into : 1. Claiborne group, characterized by Cardita 

 densafAi, Ostrea selliformis, Crassatella aUa, Pectunculus stamineus, 

 Iferetrixcequorea, Gralehcpia hydi, Leda ccelata, and Crepidula Virata. 

 2. Jackson group, characterized b}' Umbrella planulata, Cardium 

 nicollettit, Conns tortillis, Cyiyrcea fenestralis, Galeodia 2Jeterso7ii, smd 

 Rostellaria extenta. 3. St. Stephen's group, characterized by Pecten 

 poulsoni, and OrbitulUes mantellL 4. Vicksburg group, characterized 

 by Corhula alta, Crassatella mississippiensis, Area mississippiensis^ 

 lleretrix sobrina, 3f. I'mitabilis, and Turbinella wilsord. He described,* 

 from Jackson, Miss., ;Hid Claiborne, Ala., Endopachys expansum^ E. 

 triangulares E. aUicostatum, Flabellum loailesi, Osteodes irroratus, 

 Turbinolia lunuUtiformis, Chiton antiqiius, C. eocenensis ; and from 

 White river, Arkansas, Petrophyllia arkansasensis; from the IMiocene, 

 of Colorado and the West, Anomia subcostata, Mercenaria perlami- 

 nosa, Pecten heermani. Pandora bilirata, Astarte thomasi^ Turritella 

 secta, Ostrea contracta, and Tdmonea calif ornica. 



Prof. Wm. P. Blake noticed Miocene strata, containing the remains 

 of Infusoria and Polythalamia, near Monterey, California. The strata 

 are white, porous, light, resemble chalk, and are situated about two 

 miles southeast from the center of Monterey, and form part of a hill 

 which fronts the bay, and rises on the east side of the stage-road to San 

 Francisco to the height of 500 or 600 feet. 



Tuomey and Holmesf described, from the Pliocene of South Carolina, 

 Cellepora formosa^ C. depressa, C. radiata^ C. tessellata, Membrani- 

 pora lacinia, Placunanomia plicata, Ostrea ravenelana, Janira 

 affinis, Pecten compariiis, P. peedeensis, Mytiliis injlatus. Area hians, 

 A. rustica, Pectunculus loivis, Lucina costata, Crassatella gibbesi, 

 Psammocola pliocena, Deatalium pliocenu^n, Hipponix bulli, Ifono- 

 donta kiaivahensis, Trochus armillatus^ T. gemma, Terebellum stria- 

 tum, T. biirdeni, T. etiwanensis^ Voluta trenhohni, Porcellana olivi- 

 forniis. Purpura tridentata, Cancellaria depressa, C. venusta^ Busycon 

 conradi, C assidulus carolinensis, and Fasciolaria tuomey i. 



J. McCrady described, from the same strata, Psammechinus exoletuks, 

 Agassizia porifera, Amphidetus amplijlorus, A. gothicus, Brissus 

 sjjatiosits, Plagionotus holniesi, and P. ravenelanus. 



Dr. TraskJ described, from the Pliocene of Santa Barbara, California, 

 Chemnitzia papulosa s Tornatella elliptica, Murex fragilis, Fusus bar- 

 barensis, F. robustus, and F. rugosus. 



* Proc. Acad. Nat. Sei., vol. vii. 



t Tuomey and Holmes' Fossils of South Carolina. 



t Proc. Cal. Acad. Sci., vol. i. 



