NO. 3542 OSTRACODS — HOBBS AND WALTON 7 



reaching level of penis; ventral finger, also slender, and sinuous. 

 Clasping apparatus with distinct vertical and horizontal rami meeting 

 at an angle of approximately 100°. Vertical ramus slightly convex 

 anteriorly with both mai-gins entire; horizontal ramus slightly convex 

 ventraUy with external border entire, internal border with three 

 distinct teeth and six apical denticles. 



Female. — Shell of triunguis female (fig. Iw) proportionately higher 

 than that of male and larger; posterior decUvity of dorsal margin 

 more sudden than in that of male; ventral margin entire. Sub- 

 marginal setae as in male. Length of allotype .698 mm., height .398 

 mm. 



Type-locality and range. — Rapids in New River at Pembroke, 

 Giles County, Va., where it was associated with Donnaldsoncythere 

 ileata Hobbs and Walton (1963). 



Two additional specimens were taken from the Cascades on Little 

 Stony Creek, also in Giles County. Here it was associated with 

 D. ileata, D. scalis Hobbs and Walton (1963), and Phymocythere phyma 

 (Hobbs and Walton, 1962). 



Types. — The holotypic male and the allotypic female are deposited 

 in the U.S. National Museum (no. 111257). A paratype male is in 

 the joint collection of the authors. 



Hosts. — At the type locality, the specimens were taken from 

 Camharus sciotensis Rhoades. At the Cascades the specimen was 

 found in a collection of crayfishes including C. sciotensis and C. b. 

 bartonii (Fabricius). 



Relationships. — Entocythere kanawhaensis seems to have its 

 closest affinities with E. dorsorotunda Hoff (1944) and E. elliptica 

 Hoff (1944) but differs from both species by possessing only three 

 teeth along the internal border of the horizontal ramus of the clasping 

 apparatus of the male. 



Remarks. — The name kanawhaensis refers to the fact that the 

 species is an inhabitant of the Kanawha River drainage system. 



Thermastrocythere, new genus 



Diagnosis. — Terminal tooth of mandible with cusps. Copulatory 

 complex of male without finger guard; ventral portion of peniferum 

 appearing to be deeply incised (actually apparent rami at least 

 partially ensheathed by delicate membrane), its posterior "ramus" 

 slender and curved with apex directed anteriorly, its apparent anterior 

 "ramus" also curved with tip directed ventrally — the two rami ap- 

 pearing to oppose one another; anterior "ramus" consisting of the 

 prominent penis; penis large, its length subequal to anterior-posterior 

 dimension of distal portion of peniferum. Clasping apparatus ex- 

 tending ventrally beyond peniferum with distinct slender vertical 



