192 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 48. 



Branchiobdella americana from Cambarus viridis, C. latimanus, C. 

 Jiayi (Texas); C. rusticus, C. immunis, and Cambarus sp. (Raleigh, 

 North Carolina). 



BrancTiiobdella tetrodonta from Astacus Tdamaihensis (Klamath 

 River, California). 



Bdellodrilus illuminatus from Cambarus bartonii and " crayfish' ' 

 (Lake Clear, New York) . 



'/iomm. 



to mm. 



Fig. 2.— Ceratodrilus thysanosomus. 

 Ventral view. 



Fig. 3.— Ceratodrilus thysanosomus. 

 Dorsal view. 



Bdellodrilus pulcherrimus from Cambarus bartonii (Watauga County, 

 North Carolina) ; "crayfish" (Lake Clear, New York) . 



Bdellodrilus instabilis from Cambarus bartonii (Philadelphia, Penn- 

 sylvania; Watauga County, North Carolina); "crayfish" (Lake 

 Clear, New York) . 



Cambarincola pJiiladelpliica from Cambarus bartonii (Philadelphia, 

 Pennsylvania; Watauga County, North Carolina). 



Cambarincola macrodonta from Cambarus diogenes (Boulder, 

 Colorado). 



