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PROCEEDINGS OF THE NATIONAL MUSEUM 



at 69, 71, 87, 88, 90, 91, 93, 111; Dt. daphnioides at 72; Dt. jalcata at 

 87-93, 111, 112; Dn. ardis and Dt. suteri at 30; and E. internotalus at 

 30, 88, and 90. 



Branchiobdellid associates include B. illuminatus at stations 19, 

 87, 125; C. branchiophila at 18, 29, 72, 87-93, 112; C.jallax at 18, 71, 

 72, 87-89, 91, 92; C. heterognatha at 72, 125; C. holostoma at 18, 19; 

 C. ingens at 18, 72; C. philadelphica at all stations except 18, 30, 72; 

 P. alcicornus at 18, 19, 72; and Xd.formosus at 88-92, and 112. 



C 



d 





Figure 12. — Ankyrodrilus koronaeus: a, dorsal view; b, ventral view of male reproductive 

 system; c, upper jaw; d, lower jaw. A. legaeus, jaws: e, upper;/, lower. (Abbreviations : 

 b=bursa; ed=efferent duct; f=funnel, sg=spermiducal gland.) 



Remarks. — Present distribution records indicate that A. koronaeus 

 and its congener, A. legaeus, are allopatric. Both species of Ankyrodri- 

 lus are inhabitants of middle altitude streams and may vicariate there 

 for Xg. instabilius as inhabitants of the chelipeds of the host. 



Ankyrodrilus legaeus Holt 



Figures 12e-f 

 Ankyrodrilus legaeus Holt, 1965, p. 12. 



Diagnosis. — "Upper jaw with five teeth; lower jaw with four — five 

 teeth; teeth of upper jaw of unequal length, lateral teeth and median 



