30 



CRETACEOUS DEPOSITS OF THE EASTERN GULF REGION. 



Mortoniceras sp. (aff. J/, texanum Roenier), is represented in New Jersey by Mortoniceras 

 delaivarense (Morton) ; the latter is also confined to the Merchantville clay marl. 



PART OF EXOGYRA PONDEROSA ZONE BETWEEN THE MORTONICERAS STTBZONE AND THE EXOGYRA 



COSTATA ZONE. 



From the part of the zone of Exogyra ponderosa included between the top of the Morton- 

 iceras subzone and the base of the Exogyra costata zone 70 species, questionably 74, are known. 

 These are as follows: 



Fossils from the part, of the Exogyra ponderosa zone between the' Mortoniceras subzone and the zone of Exogyra costata. 1 



Mollusca — Continued. 



Anomia argentaria Morton, a b c. 



A. lintea Conrad, a? b. 



A. sp. nov. (also found at Snow Hill, N. C, etc.). 



bed. 

 Paranomia scabra (Morton), a b. 

 Cymella bella Conrad, ab c. 

 Veniella conradi (Morton), a b c. 

 Etea carolinensis Conrad, abed. 

 Eriphyla conradi (Whitfield), b. 

 Crassatellites carolinensis Conrad, b? c? 

 C. sp. nov. b. 



Scambula perplana Conrad, a b. 

 Radiolites austinensis Roemer. b c. 

 Lucina glebula Conrad, b? c. 

 Cardium eufaulense Conrad, a b c. 

 C. spillmani Conrad, a b c. 

 C. duniosum Conrad, a b. 

 Isocardia cliffwoodensis Weller (?) 6. 

 Cyprimeria depressa Conrad, a b c d. 

 C. alta Conrad, a b. 



nsata I Conrad), a b. 

 Aphrodina regia Conrad. 6. 

 Cyclothyris alta Conrad, be. 

 Legumen planulatum (Conrad), a b c. 

 Baroda carolinensis Conrad, b. 

 Linearia? ornatissima Weller. a b. 

 Leptosolen biplicata (Conrad), a b c d. 

 < ymbophora lintea (Conrad), abed. 

 Schizodesma appressa Gabb. a b c. 

 Corbula crassiplica Gabb. a b c. 

 C. carolinensis Conrad, bed. 

 Panopea decisa Conrad, a b. 

 Gastrochaena americana Gabb. a b. 

 Dentalium ripleyanum Gabb. a b c. 

 Lunatia obliquata Meek and Hayden. 

 Gyrodes crenata Conrad, ab c. 

 Turritella trilira Conrad, a b c. 

 T. quadrilira Johnson, be. 

 Baculites asper Morton. 6 c. 



Vermes: 



Serpula cretacea (Conrad), a b. 



Hamulus onyx Morton, a b c. 



H. squamosus Gabb. a b c. 



H. major Gabb. b c. 

 Mollusca: 



Nucula percrassa Conrad, abed. 



N. sp. (cf . undescribed species from Snow Hill. N. < . . 

 be. 



Leda pinnaforma Gabb. a b. 



L. longiirons Conrad. .1 6 c. 



L. protexta Conrad, a b. 



Cucullsea carolinensis (Gabb). b c. 



Trigonoarca maconensis (Conrad), b. 



Nemodon brevifrons Conrad, n b. 



N. sp. nov. b e. 



Barbatia lintea Conrad, b c. 



Glycymeris subaustralis (D"Orbigny). a b. 



Gervilliopsis ensiformis (Conrad), a b c. 



Ostrea plumosa Morton, a b c. 



O. tecticosta Gabb. a b c. 



0. larva Lamarck, a b. 



0. panda Morton, a b c. 



O. sp. nov. (large), b. 



0. sp. nov. (also found at Blue Banks Landing, N. C, 

 etc.). 6 c. 



0. sp. nov. (very irregular), a b. 



Gryphaea vesicularis Lamarck, a b. 



G. vomer (Morton), a b. 



G. aucella Roemer. 6 c. 



G. sp. (smooth, convex), b. 



Exogyra ponderosa Roemer. b c. 



E. ponderosa var. erraticostata Stephenson, b c. 



Trigonia sp. nov. (also found at Snow Hill. X. (.'., 

 etc.). b. 



Pecten quinqti' Sowerby. a b c. 



P. orgillensis Conrad, a ' 



P. simplicius Conrad, a b c. 



P. burlingtonensis Gabb. b c. 



P. quinquenarius Conrad, a b. 



Lima reticulata Forbes, a b c. 



Of the species listed S, questionably i), are restricted to that part of the zone of Exogyra 

 ponderosa under consideration: 44 range downward into the Mortoniceras subzone; 7 range on 

 downward into the basal beds of the Eutaw formation (Chattahoochee region); and 46, ques- 

 tionably 47. range upward into the zone of Exogyra costata. CrassateUiUs carolinensis Conrad, 

 though questionably identified, belongs to a flat type of the genus restricted in range below the 

 Exogyra costata zone and is treated as an identified species. Three species are questionably 

 identified from the beds under consideration. 



6 c. 



' a, Exogyra costata zone; 6, Eioggra ponderosa zone above Mortoniceras subrone: c. Mortoniceras subzone; d, basal beds of Eutaw formation. 



