Howe and Laurencich, 1958, Introd. Study Cre- 

 taceous Ostracoda, p. 66, text fig. 



Shell triangular-ovate, highest medially, height 

 a little more than half length; dorsal margin 

 strongly and more or less evenly convex; ventral 

 margin gently convex in left valve, sinuous in 

 right; anterior margin narrowly rounded, ex- 

 tended medially, curved below, truncated above; 

 posterior margin produced below as rather strong 

 subacute beak. Left valve larger than right, ex- 

 tending strongly beyond right along dorsum, an- 

 terior and posterior slopes and midventer, little or 

 no extension terminally. Surface smooth. 



The hinge consists of a groove in the hinge face 

 of the left valve into which fits edge of right 

 valve. Along dorsal slopes, crenulations that are 

 characteristic of Bairdoppilata Coryell, Sample 

 and Jennings are lacking. Inner lamellae of moder- 

 ate width, with line of concrescence and inner 

 margin slightly separated terminally. Other in- 

 ternal features obscured by recrystallization and 

 by matrix. 



Length of figured specimen (PI. 1, Fig. 5a) 

 0.92 mm, height 0.55 mm, convexity 0.43 mm. 



Remarks.— The present specimens conform to 

 most of the characteristics prescribed for the 

 species by Alexander, but some of the Atkinson 

 shells are finely pitted. Apparently this is a mat- 

 ter of preservation, because the more weakly 

 pitted shells mostly appear to be abraded or re- 

 crystallized. 



Occurrence. — Lower member of Atkinson For- 

 mation in the following wells: (1) Humble Oil and 

 Refining Company's No. 1 Bennett and Langdale 

 well, Echols County, Georgia, core samples 3,700- 

 3,710 feet; (2) Sun Oil Company's No. 1 Russell, 

 Suwannee County, Florida, core samples 3,070- 

 3,080 feet. The species was described as rare in 

 the upper part of the Denton and lower part of 

 the Weno Formations, middle Washita Group of 

 northeastern Texas. 



Bairdia ? sp. 



Plate 1, Figure 6 



Shell subtriangular in side view, highest medi- 

 ally ; dorsal margin strongly convex, subacuminate 

 medially; ventral margin gently convex, some- 

 what sinuous ; anterior margin narrowly rounded, 

 extended below; posterior margin acuminate, 

 strongly extended below. Left valve moderately 

 convex. Surface smooth. 



Length of figured left valve 0.97 mm, height 

 0.65 mm, convexity of valve 0.33 mm. 



Remarks. — No definite comparisons can be made 

 between this form and described species because 

 only the left valve has been found. The strongly 

 convex dorsum and general outline are suggestive 

 of Bairdoppilata acuticauda (Veen) (1934, p. 8) 

 or Bai7-dia pseudocretacea Veen (1934, p. 8) both 

 of Late Cretaceous age. 



Occurrence. — Lower member of Atkinson For- 

 mation, Humble Oil and Refining Company No. 1 

 Cone well, Columbia County, Florida, core sample 

 3,545-3,556 feet. 



Superfamily Cypridacea Baird, 1845 



Family Paracyprididae Sars, 1923 



Genus Paracypris Sars, 1866 



Paracypris goodlandensis Howe and Laurencich 



Plate 1, Figures 7 a-c 



Paracypris siliqua Jones and Hinde. Alexander, 



1929, Univ. Texas Bull. 2907, p. 64, pi. 3, figs. 



11, 13. 

 Paracypris goodlayidensis Howe and Laurencich, 



1958, Introd. Study Cretaceous Ostracoda, p. 



448, text fig. 



Shell elongate-sublanceolate in side view, high- 

 est about three-eighths from anterior end ; dorsal 

 margin moderately convex, truncated posterior to 

 position of greatest height and with broadly ob- 

 tuse posterior cardinal angle in some specimens, 

 evenly rounded in others; ventral margin long 

 and nearly straight, slightly concave in midpor- 

 tion; anterior margin rounded with greatest ex- 

 tension ventral to midheight; posterior margin 

 acuminate ventral to midheight. Left valve larger 

 than right, overlapping and extending beyond the 

 other most conspicuously along venter, less so 

 along dorsum and dorsal slopes. Surface smooth. 



Hinge edge of right valve smooth and simple, 

 apparently overlapped slightly by edge of left. 

 Inner lamellae very broad terminally, although 

 partly concealed in single separated right valve at 

 hand. Muscle scar not observed (PL 1, Fig. 7a). 



Length of a figured specimen (PI. 1, Fig. 7a) 

 0.87 mm, height 0.35 mm, thickness 0.17 mm. 



Remarks. — -The truncation of the dorsal margin 

 and the slightly concave venter in the present 

 specimens relate them to P. goodlandensis Howe 

 and Laurencich (1958, p. 448) from the upper 

 two-thirds of the Goodland, the Kiamichi, and the 



13 



