42 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



At each station Dt. chalaza was associated with As. asceta. 

 Branchiobdellid associates include B. illuminatus at stations 40, 

 41, 127; and C.fallax at 40. 



Dactylocythere daphnioides (Hobbs) 



Figures If, k, 10a 



Entocythere daphnioides Hobbs, 1955, p. 325, figs. 1, 2, 5-9. 

 Dactylocythere daphnioides Hart, 1962, p. 130. 



Diagnosis. — Posteroventral margin of shell with conspicuous 

 prominence. Accessory groove extending dorsally to level of sper- 

 matic loop; clasping apparatus with junction of horizontal and vertical 

 rami forming angle less than 90°, somewhat thickened at junction, 

 and internal border of horizontal ramus with proximal tooth and 

 four or five distal serrations. Female with J-shaped rod and 

 amiculum. 



Range. — From the Watauga drainage system in Avery and 

 Watauga Counties, N.C.; the New River system from Alleghany 

 and Ashe Counties, N.C., to Pocahontas County, W. Va.; and the 

 Pound drainage system in Dickerson County, Va. 



Specimens examined. — Approximately 100 specimens in eight 

 collections from the following stations: 70, 72, 73, 75, 79-81, and 

 116. All localities are in the New River drainage in Walker, Mill, 

 and Wolf Creeks at elevations of 488 to 561 m. 



Host and associates. — In all stations listed Dt. daphnioides was 

 found on Cambarus sciotensis. 



Donnaldsoncythere ileata was the only ostracod associate and was 

 present in all stations except 70. 



Branchiobdellid associates include C. ingens at all stations; P. 

 alcicornus at 70, 72, 73, 75, 79, 81; C. fallax at 70, 72, 75, 79, 81; 

 C. branchiophila at 72, 73, 75, 79, 81, 116; C. heterognatha at 70, 72, 

 79-81, 116; A. koronaeus at 72; and A. legaeus at 81. 



Dactylocythere falcata (Hobbs and Walton) 



Figures 7j, 106 



Entocythere falcata Hobbs and Walton, 1961, p. 379, figs. 2, 3, 7, 8. 

 Dactylocythere falcata Hart, 1962, p. 130. 



Diagnosis. — Posteroventral margin of shell without conspicuous 

 prominence. Accessory groove extending dorsally beyond spermatic 

 loop; clasping apparatus scythelike usually without teeth or serrations 

 along internal border of horizontal ramus, although some specimens 

 with single tooth near midlength. Female with J-shaped rod and 

 amiculum. 



