Genus Cvtherura Sars, 1866 



Cytherura glossensis Brown, n. sp. 



Plate 6, Figures 18, 19 



Carapace small, spindle-shaped to ovate ; dorsal 

 margin faintly convex ; ventral margin sinuous ; 

 anterior margin obliquely rounded; posterior 

 margin angular, elongate caudal process slightly 

 above middle. 



A fine ridge commences in the anterior ventral 

 area extends above and parallel to the ventral 

 margin bends inward at the postero-ventral junc- 

 tion and forms a distinct open loop on the pos- 

 terior third ; a short weak ridge extends medially 

 from the anterior margin, bifurcates atop the 

 anterior slope and dies out antero-medially. Sur- 

 face reticulate as a fine mesh arranged in about 

 seven large weakly defined depressions. Internal 

 features characteristic of the genus. 



Dimensions : Holotype : length 0.42 mm ; height 

 0.18 mm ; biconvexity 0.14 mm. 



Occurrence: Rare to common in lower Peedee 

 and in the Black Creek, localities A, C, F, G, H, 

 I, J, and K. U.S.N.M. 129037, 129038. 



Genus Eucytherura Miiller, 1894 

 Eucytherura curta (Jennings) 

 Plate 6, Figures 20, 21 



Cythereis curta Jennings, 1936, Bull. Am. Pal- 

 eontology, vol. 23, no. 78, p. 52, pi. 7, figs. 

 4a-b. 



Carapace small, thick ; quadrate in lateral view ; 

 dorsal margin straight; ventral margin straight 

 to slightly concave medially, concealed by over- 

 hang medially; dorsal and ventral margins con- 



verge posterad ; anterior margin broadly rounded ; 

 posterior margin more sharply rounded, extended 

 below in a blunt subdorsal caudate process. 



Surface of valves reticulate; a ventral ridge 

 commences medially at the anterior margin swings 

 backward to the ventral margin posterad of the 

 antero-ventral junction, outlines and partly con- 

 ceals the ventral margin from above, swings in- 

 ward at the postero-ventral junction, and 

 passes into the valve above the posterior mar- 

 gin ventrally; a second ridge commences just 

 dorsad of the first, extends backward medially 

 to a subdued subcentral nodose process, turns ob- 

 liquely, and extends backward to a point above 

 the posterior margin dorsally; a third ill-defined 

 ridge extends from the nodose process to the 

 outer margin just anterad of a small glassy eye 

 tubercle lying at the antero-dorsal junction. Short, 

 eccentrically-arranged ridge-like projections nor- 

 mal to the main ridges give the carapace a coarsely 

 reticulate appearance. 



Hinge in right valve consists of an anterior 

 pointed tooth and postjacent socket with an elong- 

 ate carved crenulate tooth located at the postero- 

 dorsal junction, the terminal teeth being connected 

 by a faintly crenulate interterminal groove form- 

 ed of the dorsal marginal edge. Hinge of the left 

 valve the counterpart of the right valve. Line of 

 concrescence and inner margin widely separated. 

 Valves rugose internally. 



Dimensions : Fig. 20 : length 0.47 mm ; height 

 0.23 mm. 



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

 E, and F. U.S.N.M. 129039, 129040. 



Remarks : The shape, hingement, and nature 

 of the carapace places this species in the genus 

 Eucytherura Miiller. 



25 



