]y inflated ; greatest height median ; dorsal margin 

 gently convex to sinuous ; ventral margin straight 

 with a concave reentrant antero-medially ; an- 

 terior margin broadly and evenly rounded, spinose 

 below, with one or two rows of deep oblong pits 

 behind and immediately adjacent to the margin ; 

 posterior margin less broadly rounded to suba- 

 cute. Coarsely unisulcate or bisulcate subjacent 

 to the anterior cardinal angle. Left valve typically 

 larger than right, most conspicuous overlap along 

 dorsum and anterad of anterior cardinal angle. 

 Cardinal angles obtuse. Convexity of valves 

 strong; surface of valves grossly reticulate to 

 smooth and sparsely punctate. 



Hinge of right valve consists of a high pointed 

 anterior tooth, notched anterad, a subjacent ovate 

 socket connecting with a wide faintly crenulate 

 groove lying along the dorsal margin and term- 

 inating posterad at a large square-tooth at the 

 posterior cardinal angle. Left valve antithesis of 

 the right. Line of concrescence and broad inner 

 margin coincident. Muscle scar, located in a shal- 

 low submedian pit, consists of a curvilinear row 

 of three spots and a single larger anterior spot. 

 Female dimorphs are shorter and more tumid 

 than the male. 



Geologic range: Upper Cretaceous 



Relationships: This genus shows some affinity 



to Anticythereis Van den Bold (Pseudocythereis 



Jennings) but can be separated on the basis of 



size, hingement, and external shell characteristics. 



Velarocythere scuffeltonensis Brown, n. sp. 

 Plate 5, Figures 5-9 



Carapace oblong-ovate in lateral view ; widest 

 anterad; highest medially; dorsal margin weakly 

 convex, sinuous posterad ; ventral margin slightly 

 concave antero-medially ; anterior margin broadly 

 rounded ; posterior margin more narrowly round- 

 ed ; left valve larger than right, extending beyond 

 the right along the ventrum and markedly at the 

 broadly obtuse cardinal angles. 



Midportion of valves strongly inflated ; ends 

 slightly compressed; entire valve surface very 

 coarsely reticulate ; outlining the anterior margin 

 posterad are two concentrically arranged rows 

 of deep depressions bounded dorsally by a short 

 oblique sulcus adjacent to the anterior cardinal 

 angle and extending to the dorsal margin just 

 posterad of the anterior cardinal angle. 



Hinge of right valve consists of a high rounded 

 anterior tooth and postjacent socket, a long wide 

 crenulate interterminal bar connecting to a high 



square posterior tooth; left valve antithesis of 

 right. Line of concrescence and broad inner mar- 

 gin coincident. Muscle scars, located in a shallow 

 submedian pit, consist of a subvertical row of 

 three spots and a single anterior spot. 



Dimensions: Holotype: female; length 0,75 

 mm ; height 0.34 mm ; biconvexity 0.35 mm. 



Occurrence: Peedee only, localities A, C, and 

 F. U.S.N.M. 129006, 129007, 129008, 129009, 

 129010. 



Velarocythere legrandi Brown, n. sp. 

 Plate 5, Figures 1-4 



Carapace subovate in side view ; widest in ante- 

 rior third ; greatest height medially ; dorsal margin 

 gently convex to sinuous ; ventral margin slightly 

 concave medially ; anterior margin broadly round- 

 ed, compressed ; posterior margin less broadly 

 rounded, compressed ; ends bear two parallel rows 

 of five spines; left valve larger than right, ex- 

 tending beyond the other ventrally and at the 

 broadly obtuse cardinal angles. 



Midportion of valves very strongly inflated 

 with a tumid overhang ventrally, sharply truncate 

 anterad and separated from the anterior fourth 

 by a sharp elliptical ridge which terminates at 

 the dorsal margin medially, and lies above and 

 subparallel to the ventral margin, terminating 

 subjacent to the postero-ventral junction ; midpor- 

 tion of valve grossly and subconcentrically re- 

 ticulate ; compressed posterior one-fourth smooth 

 to slightly papillose ventrally ; the anterior fourth, 

 below the sharp elliptical ridge, bears two con- 

 centric rows of deep depressions bounded dorsal- 

 ly by a shallow oblique sulcus subjacent to the 

 anterior cardinal angle. 



Dimensions : Figs. 3, 4 : length 0.82 mm ; height 

 0.33 mm ; biconvexity 0.39 mm. 



Occurrence: Peedee only, localities A and C. 

 U.S.N.M. 129011, 129012. 



Remarks : The grossly reticulate midportion 

 readily distinguishes this species. Named for H. 

 E. LeGrand, U. S. Geological Survey. 



Velarocythere cacumenata Brown, n. sp. 

 Plate 5, Figures 13-15 



Shell in side view, oblong-ovate; widest at an- 

 terior one third ; highest post-medially ; dorsal 

 margin weakly convex, sinuous posterad; ventral 

 margin slightly concave medially; ends rounded, 

 finely spinose. Left valve larger than right, ex- 

 tending beyond the right along the ventrum and 

 markedly at the broad and obtuse cardinal angles. 

 Dorsal edge thickened. 



21 



