ilarly nodose but is more elongate than 0. deli- 

 catula. 



Occurrence. — Early Cretaceous, probably of 

 Washita (Albian) age. Caledonia Prison Farm 

 water well T-4, Halifax County, North Carolina, 

 166-171 feet and 286-291 feet; Odom water well 

 T-l, Northampton County, North Carolina, 190- 

 195 feet. 



Family Progonocytheridae Sylvester-Bradley, 



1948 



Genus Centrocythere Mertens, 1956 



Centrocythere annulopapillata Swain and Brown, 



n. sp. 



Plate 3, Figures 16a-c 



Shell subpyriform in side view, highest about 

 two-fifths from anterior end, hinge margin nearly 

 straight, about three-fifths of shell length, cardi- 

 nal angles broadly obtuse, the posterior smaller 

 and more sharply curved than anterior ; ventral 

 margin slightly convex, somewhat sinuous due to 

 midventral overhang of margin by shell surface, 

 converging with dorsum posteriorly ; anterior 

 margin broadly curved, somewhat extended below, 

 slightly truncate above ; posterior margin narrow- 

 ly rounded, extended medially, truncate above. 

 Left valve slightly larger than right, overlapping 

 and extending beyond right anteriorly and dor- 

 sally. Valves moderately convex, greatest convex- 

 ity midventral in position. Terminal marginal 

 portions of each valve compressed, and margins 

 are finely spinose. 



Anterodorsally, valves bear small oblique eye 

 tubercles. Median, ventral, and posterior portions 

 of valve surface ornamented by low, concentri- 

 cally arranged, papillate ridges; dorsally, similar 

 ridges lie subvertical to margin. 



Hinge of right valve consists of an anterior 

 rounded tooth and posteriorly adjacent small 

 socket, an interterminal crenulate groove in hinge 

 margin, and a posterior tooth, details of which 

 are obscured by matrix in available specimen. 



Length of holotype (PI. 3, Fig. 16a) 0.62 mm, 

 height 0.40 mm, convexity 0.36 mm. 



Relationships. — The pyrif orm outline and papil- 

 late ornamenting ridges distinguish this species 

 from others described from the Cretaceous. 

 Among other Cretaceous species Cytheropteron 

 sherborni Jones and Hinde is closely similar in 

 shape, papillate concentric ridges, and spinose ter- 

 minal margins, but was described (Jones and 

 Hinde, 1890, p. 42) as having a pronounced mid- 



dorsal sulcus that ends in a minute subcentral 

 pit, features which are lacking in the present 

 form. 



Occurrence. — Lower member of Atkinson For- 

 mation, Sun Oil Company's No. 1 Russell well, 

 Suwannee County, Florida, core sample 3,070- 

 3,080 feet; Humble Oil and Refining Company's 

 No. 1 Bennett and Langdale well, Echols County, 

 Georgia, core sample 3,700-3,710 feet; Sun Oil 

 Company's No. 1 Barlow well, Clinch County, 

 Georgia, core sample 3,709-3,711 feet. 



References 



Alexander, C. I., 1929, Ostracoda of the Cretaceous of 

 North Texas: Univ. Texas Bull. 2907, 137 p., 

 10 pis. 



, 1933, Shell structure of the genus Cyther- 

 opteron and species from the Cretaceous of Texas : 

 Jour. Paleont., v. 7, p. 181-214, pis. 25-27. 



Applin, P. L. and Applin, E. R., 1947, Regional sub- 

 surface stratigraphy, structure and correlation 

 of middle and early Upper Cretaceous rocks in 

 Alabama, Georgia and north Florida: U. S. Geo- 

 logical Survey Oil and Gas Investigations (Pre- 

 liminary) Chart 26. 



Applin, E. R., 1955, A biofacies of Woodbine age in 

 southeastern Gulf Coast region: U. S. Geol. Sur- 

 vey Prof. Paper 264-1, p. 187-197, pis. 48, 49. 



Bolin, E. J., 1956, Upper Cretaceous Foraminifera, 

 Ostracoda and Radiolaria from Minnesota: Jour. 

 Paleont., v. 30, p. 279-298, pis. 37-39. 



Bosquet, J., 1847, Description des Entomostraces fos- 

 siles de la Craie de Maestricht: Soc. Roy. Sci. 

 Liege Mem., v. 4, p. 353-378, pis. 1-4. 



Brady, G. S., 1869, On the Crustacean fauna of the 

 salt marshes of Northumberland and Durham: 

 Nat. Hist. Trans. Northumberland and Durham, 

 1868, v. 3, p. 125. 



Brown, P. M., 1957, Upper Cretaceous Ostracoda from 

 North Carolina: North Carolina Dept. Cons, and 

 Devel., Bull. 70, 28 p., 7 pis. 



1958, Well Logs from the Coastal Plain 



of North Carolina: North Carolina Dept. Cons. 

 and Devel, Bull. 72, 68 p., 8 pis. 



Butler, E. A., and Jones, D. E., 1957, Cretaceous Os- 

 tracoda of Prothro and Rayburn Salt Domes, 

 Bienville Parish, Louisiana: Louisiana Geol. Sur- 

 vey, Geol. Bull. 32, 49 p., 6 pis. 



Calahan, L. W., 1939, Diagnostic fossils of the Arkan- 

 sas-Louisiana-Texas area: Shreveport Geol. Soc, 

 Guidebook Fourteenth Ann. Field Trip, p. 36-56. 

 pi. 1-9. 



Howe, H. V., and Chambers, J., 1935, Louisiana Jack- 

 son Eocene Ostracoda: Louisiana Dept. Cons., 

 Geol. Bull. 5, 65 p., 6 pis. 



41 



