CENOZOIC TIME — TERTIARY. 917 



2. Chipola. — Orthmilax Gahhi Dall, Strombus Aldrichi Dall, Turritella suhgrun- 

 difera Dall, T. Chipolana Dall, PolUnices Burnsii Dall, Ampullina Fischeri Dall, Clava 

 Chipolana Dall, Bittium Chipolanum Dall, Modulus compactus Dall, Turritella indenta 

 var mixta Dall, Tiffta acutissima Dall. 



3. YORKTOWN. — Osirea j^ercrassa Con., 0. disparilis Con., Pecten Jeffersonius Ssuj, 

 P. Madisonius Say, P. Clintonius Say, Mytiloconcha incurva Con., J.rca idonea Con., 

 ^. suhrostrata Con., 4. incilis Say, Striarca centenaria Say, Pectunculus suhovatus Say, 

 P. quinquerugatus Con., Astarte undulata Say, Crassatella undulata Say, C. melina Con., 

 C. Marylandica Con., Lucina anodonta Say, i. cribraria Say, Diplodonta acclinis Con., 

 Carditamera arata Con., Cardium laqueatum Con., Fenws cortinarea Rogers, Cytherea 

 Marylandica Con., C staminea Con., Isocardia fraterna Say, Dosinia acetabula Con., 

 Mactra delumbis Con., Petricola centenaria Con., Panopcea rejlexa Say, P. ^meri'ca?ia 

 Con., Pholadomya abrupta Con., Corbula idonea Con., Tellina biplicata Con., Terebra sim- 

 plex Con., Ecphora qttadricostata Say, Fasciolaria rhomboidea Rogers, Typhis acuticosta 

 Con., Urosalpinx trossulus Con., Fusus parilis Con., F. exi7«s Con., P. strumosus Con. 



The Miocene species of the Ashley Marl bed. South Carolina, determined by Dall (1894,) 

 include Astarte vidua Say, Ecphora quadricostata, an Amusium not distinguishable from 

 ^. Mortoni, Lucina contracta, Dentalium attenuatum, Pecten decennarius, with others of 

 Corbula, Leda, Toldia, Tellina, 3Iarginella, Solen, Modiola. The species show closer 

 relations to the Yorktown epoch than to the Chipola. Dall adds that the change in the 

 rock to the phosphate condition probably took place in Pliocene time like that of the 

 similar phosphatic pebbles of Peace River, Fla. 



The Miocene of Gay Head, Martha's Vineyard, afforded Dall : Carcharodon angus- 

 tidens, Hemipristis serra, Oxyrhina hastalis ; the Crustacean ArchcBoplax signifera 

 Stimson ; the Mollusks, Toldia limatula, Y. sapotilla, Cardium Virginianum, Nucula 

 Shaleri Dall, Gemma purpurea var. Totteni, My a arenaria, My a truncata, Glycimeris 

 rejlexa, Chrysodomus Stonei Pilsbury. The overlying Pliocene contained, according to 

 J. B. Woolworth, Corbicula densata, and Venericardia borealis of Pliocene type. 



PLIOCENE. 



Floridian. — Area scalarina Heilp., Arcoptera avicidmformis Heilp., Area crassicosta 

 Heilp., Chama crassa Heilp., Cardium Dalli Heilp., Venus rugatina Heilp., Cythara ter- 

 minula Dall, Strombus Leideyi Heilp., Siphocyprcea problematica Heilp., Vasum horridum 

 Heilp., Fasciolaria scalarina Heilp., Liochlamys bulbosa Heilp., Turbinella regina Heilp. 



The above lists of Atlantic border and Gulf border species are from G. D. Harris. 

 The species are "characteristic" in being found " either exclusively, typically, or most 

 abundantly, in the group where mentioned." 



Characteristic Genera of Vertebrates. 



In this list of genera the names of those which occur in corresponding beds 

 abroad are put in small capitals ; those which are represented by existing 

 species are followed hy an interjection mark. 



EOCENE. 



PuERCo Group. — Monotremes or Marsupials (Multituberculates) : Ptilodus, Neopla- 

 giaulax, Chirox, Polymastodon. Tillodonts : Psittacotherium. Ungulates : Haploconus, 

 Periptychus, Protogonia, Protogonodon ; Pantolambda. Creodonts : Oxyclcenus, Penta- 

 codon, Triisodon, Microclcenodon, Dissacus, Deltatherium, Didymictis. Quadrumana 

 (Lemuroids) : Mixodectes, Indrodon. 



Wasatch Group. — Rodents: Paramys. Tillodonts: Dryptodon, Esthonyx, Cala- 

 MODON. Ungulates: Phenacodus, Trispondylus, Meniscotherium, Hyracops ; Coryphodon, 



