pt. 1, Cenozoic Ostracoda : U. S. Geol. Survey 

 Prof. Paper 234-A, p. 34-35, pi. 5, figs. 8, 

 11-15. 



Dimensions: Fig. 10: length 0.82 mm; height 

 0.41 mm. 



Occurrence : Peedee only, localities A and F. 

 U.S.N.M. 128938, 128939, 128940, 128941, 128942. 



Remarks: Swain (1951, p. 34-35) has recently 

 described the species, discussed its generic posi- 

 tion, and, at the same time, placed several previ- 

 ously described species in synonomy. 



Specimens from the Upper Cretaceous of North 

 Carolina show little variation in surface sculpture, 

 but are generally more coarsely reticulate than 

 specimens from Paleocene and Eocene sediments. 

 The antero-median ridges in the Cretaceous speci- 

 mens are very weakly developed. 



Trachyleberis communis (Israelsky) 

 Plate 3, Figures 10, 11 



Cythereis communis Israelsky, 1929, Arkansas 

 Geol. Survey Bull. 2, p. 14, pi. 3a, figs. 9-13. 

 Alexander, 1929, Texas Univ. Bull. 2907, p. 



101, pi. 9, fig. 18. 

 Jennings, 1936, Bull. Am. Paleontology, vol. 



23, no. 78, p. 52, pi. 7, fig. 3. 

 Schmidt, 1948, Jour. Paleontology, vol. 22, 

 p. 419, pi. 61, figs. 11-13. 

 Cythereis (Pterygocythereis) cf. C. (P) com- 

 munis (Israelsky) Swain, 1948, Maryland 

 Dept. Geol, Mines, and Water Res., Bull. 2, 

 p. 207, pi. 14, figs. 5-7. 

 Carapace subquadrate in side view; greatest 

 height at anterior cardinal angle; dorsal margin 

 nearly straight with slight convexity in middle 

 third ; ventral margin straight, moderately con- 

 verging towards dorsal margin posteriorly; an- 

 terior margin broadly rounded, thick and strongly 

 rimmed, with four to six short, blunt spines on 

 ventral portion; posterior margin angular and 

 strongly compressed, bearing a weak rim, con- 

 cave do'rsally with three to four long, blunt spines 

 on ventral portion. Left valve larger than right, 

 greatest projection at anterior cardinal angle. 



Ventral ridge, inflated and alate, extends off the 

 anterior rim, rising at the anterior ventral angle 

 and extending longitudinally parallel to and 

 slightly overhanging the ventral margin, sparsely 

 punctate on posterior fourth and abruptly trun- 

 cated by compressed posterior ; dorsal ridge rises 

 at anterior cardinal angle; irregular to bulbous 



ridge extends parallel to the dorsal margin, be- 

 ing less abruptly truncated by compressed pos- 

 terior; median ridge, inflated in anterior third, 

 rises from depressed area behind anterior rim and 

 extends to compressed posterior. Hinge teeth and 

 sockets smooth and noncrenulate. 



Dimensions: Fig. 10: length 0.79 mm; height 

 0.40 mm; convexity 0.17 mm. 



Occurrence : This species is common at all Pee- 

 dee localities and in most subsurface sections. Lo- 

 calities A, B, C, D, E, and F. U.S.N.M. 128943, 

 128944. 



Remarks : In many of the specimens at hand 

 there is a short ridge of variable development con- 

 necting the median and dorsal ridges at their pos- 

 terior ends. Both adult forms and molts show this 

 variable ridge development. Schmidt (1948, p. 

 420) mentions this feature in connection with Mt. 

 Laurel specimens. 



Trachyleberis pidgeoni (Berry) 

 Plate 7, Figures 26, 27 



Cytheridea pidgeoni Berry, 1925, Am. Jour. 



Sci., 5th ser., no. 9, p. 485, figs. 7, 8. 

 Cythereis pidgeoni (Berry) Schmidt, 1948, 

 Jour. Paleontology, vol. 22, p. 421, pi. 62, 

 figs. 2-6. 



(Not) Swain, 1951, U. S. Geol. Survey Prof. 

 Paper 234-A, p. 36, pi. 6, fig. 1. 

 Dimensions: Fig. 26: male; length 0.70 mm; 

 height 0.29 mm. 



Fig. 27 : female ; length 0.61 mm ; 

 height 0.30 mm. 



Occurrence: Peedee only, localities A, B, C, D, 

 E, and F. U.S.N.M. 128945, 128946. 



Remarks: Schmidt (1948, p. 421) has recently 

 described the species. Comparison of the present 

 specimens was made with Cythereis huntensis 

 Alexander. The two species are probably identical 

 and examination of a larger suite of specimens 

 than was available to the writer would probably 

 show C. huntensis Alexander and T. pidgeoni 



(Berry) to be dimorphic synonyms. 



I 



Trachyleberis gapensis (Alexander) 

 Plate 7, Figures 15-19 



Cythere gapensis Alexander, 1929, Texas Univ. 



Bull. 2907, p. 84, pi. 6, figs. 16, 17. 

 The external features of this species have been 

 adequately described by Alexander. Hinge of right 



14 



