ornamentation, but the latter lack the pyriform 

 outline of Veenia. The single right valve at hand 

 is insufficient for the establishment of a new spe- 

 cies. 



Occurrence. — Early Cretaceous, probably of 

 Washita (Albian) age, of the subsurface of north- 

 eastern North Carolina; rare in DuPont No. 6 

 water well, Lenoir County, composite sample from 

 depth of 723-826 feet. 



Cythereis eaglefordensis Alexander 



Plate 3, Figures 6a-h; Text Figures 9a, b 



Cythereis eaglefordensis Alexander, 1929, Univ. 



Texas Bull. 2907, p. 98, pi. 9, figs. 9, 12. 



Howe and Laurencich, 1958, Introd. Study Cre- 

 taceous Ostracoda, p. 194, Text fig. 



Shell subpyrif orm to subquadrate in side view ; 

 dimorphic, the female shells larger and higher pos- 

 teriorly than males; shell highest one-fourth to 

 one-fifth from anterior end ; dorsal margin mark- 

 edly sinuous in left valve, nearly straight in right 

 valve ; left valve with strong cardinal projection 

 at position of greatest height ; cardinal angles ob- 

 tuse, the posterior broader than anterior, neither 

 is well defined; ventral margin gently sinuous, 

 slightly concave anterad of middle ; anterior mar- 

 gin broadly curved, slightly extended ventrome- 

 dial^; posterior margin narrower, rounded and 

 extended below in females, bluntly pointed and 

 extended below in males; ventral two-thirds of 

 anterior margin finely spinose ; ventral part of 

 posterior margin bears several thicker blunt 

 spines. Left valve a little larger than right, ex- 

 tending beyond right rather strongly in cardinal 

 areas. Anterior and posterior portions of valves 

 compressed as seen in edge view; midportion 

 wedge-shaped due to subalate expansion of flat- 

 tened venter; this portion of shell moderately 

 convex ; greatest convexity posteromidventral in 

 position. 



Anterior marginal zone has narrow-crested 

 spinose rim that dorsally passes into eye tubercle 

 and ventrally dies out near position of greatest 

 height ; anteromedially shell surface is raised in a 

 large rounded, low swelling, posterior to which is 

 a low, longitudinal ridgelike elevation ; another 

 broad ridgelike expansion occurs midventrally 

 where low blunt alae are developed ; anterodorsal 

 surface behind eye tubercle is depressed as an ob- 

 lique shallow sulcus ; posteromid-dorsal surface 

 strongly elevated ; general surface coarsely, dense- 



ly, and deeply pitted in reticulate fashion, diame- 

 ter of pits about twice width of interspaces. 



Hinge of left valve consists of an anterior deep 

 crescent shaped socket which curves around pos- 

 teriorly adjacent high knoblike tooth, an inter- 

 terminal crenulate bar and adjoining dorsal fur- 

 row, and a posterior deep rounded socket; hinge 

 of left valve has an anterior high notched tooth, 

 posteriorly adjacent socket, interterminal ser- 

 rate furrow and posterior obliquely rounded high 

 tooth. Inner lamellae of moderate width, line of 

 concrescence and inner margin coincide. Free 

 margin of left valve has a prominent deep selvage 

 furrow and right valve a corresponding selvage 

 ridge. 



Length of figured specimen (PI. 3, Fig. 6a) 

 0.93 mm, height 0.50 mm, convexity 0.50 mm. 



Remarks. — The dimorphism in this species is 

 well developed, and although no dimorphism was 

 described in the Texas specimens, they appear to 

 be conspecific with the present forms. 



Occurrence. — The species was obtained from 

 the subsurface lower member of Atkinson Forma- 

 tion of Georgia and Florida in the following wells : 

 (1) Humble Oil and Refining Company's Tindel 

 No. 1 well, Jackson County, Florida, core sample 

 3,470-3,500 feet, (2) Humble Oil and Refining 

 Company's No. 1 Bennett and Langdale well, 

 Echols County, Georgia, core sample 3,700-3,710 

 feet, (3) Sun Oil Company's No. 1 Russell well, 

 Suwannee County, Florida, core sample 3,070- 

 3,080 feet. 



Cythereis quadrialira Swain 

 Plate 3, Figures 8a-c 



" Archicythereis" cf. Cythereis pidgeoni Berry. 



Schmidt, 1948, Jour. Paleont., v. 22, p. 417, pi. 



62. 

 Cythereis quadrialira Swain, 1952, U. S. Geol. 



Survey Prof. Paper 234-B, p. 84, pi. 9, figs. 27- 



30. 



Bolin, 1956, Jour. Paleont., v. 30, p. 296, pi. 39, 

 figs. 18a-c. 



Howe and Laurencich, 1958, Introd. Study Cre- 

 taceous Ostracoda, p. 227, text fig. 



The external characters of the species were de- 

 scribed by Swain (1952), while Bolin (1956, p. 

 296), discussed the hingement of his specimen 

 from the Cretaceous of Minnesota, an apparently 

 identical form. Diagnostic characteristics besides 

 shape are the double ridge along the venter, the 



31 



