260 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.55. 



in the posterior half of segment IV ; alimentary canal following the 

 mesial line of the body through segments V to IX, swinging dorsad 

 through segment IX to anal opening on the dorsal surface of seg- 

 ment X. 



The variation in the number of teeth of 20 specimens of this 

 species is shown in the following table : 



Table 5. 



CAMBARINCOLA PHILADELPHICA (Leidy). 



Astacobdella phUadelpMca Leidy, Proc. Acad. Nat. Sci. Phila., p. 209, 1851, 



on Astacus hartonii Fabricius. 

 Branchiohdella philadclphica (Leicly) Moore, Proc. Acad. Nat. Sci. Phila., 



pp. 427-428, pi. 12, figs. 4ff-4e, 1S93. 



Specimens. — Five (three=:Cat. No. 178G1, U.S.N.M.) , Cheat Bridge, 

 West Virginia (U.S.F.C.), on Camharus hartonii carinirostris Hay; 

 four (l=Cat. No. 17682, U.S.N.M.), Chenowith Creek, between 

 Beverly and Elkins, West Virginia (U.S.F.C.), on Camharus har- 

 tonii carinirostris Hay; two (Cat. No. 17683, U.S.N.M.), Laurel Fork 

 of Cheat River, near Seneca Point, West Virginia, on Camharus har- 

 tonii carinirostris Hay; four (Cat. No. 17G84, U.S.N.M.), Right 

 Hand Fork at Queens, West Virginia (U.S.F.C.), on Camharus oh- 

 scurus Hagen; five (Cat. No. 17685, U.S.N.M.), Rock House River, 

 near Baileyville, West Virginia, on Camharus dnhius Faxon; one 

 (Cat. No. 17686, U.S.N.M.), Bargers Springs, Hilton, West Vir- 

 ginia, on Camharus hartonii (Fabricius) ; one (Cat. No. 17687, 

 U.S.N.M.), Crane Creek, West Virginia, on Camharus hartonii vet- 

 eranus Faxon; five (3=Cat. No. 17688, U.S.N.M.), Elk River at 

 Cogar's Mill, West Virginia (U.S.F.C.), on Camharus hartonii sub- 

 species; two (Cat. No. 17689, U.S.N.M.), Cheat River near the 

 Pike, West Virginia (U.S.F.C.), on Camharus hartonii carinirostris 

 Hay; two (one=Cat. No. 17690, U.S.N.M.), Tilhance Creek, Black 

 Creek Valley, West Virginia (E. L. G.) ; one (Cat. No. 17691, 

 U.S.N.M), Indian Creek, tributary of the Elk River in Kanawha 

 Count}^, West Virginia on Camharus hartonii veteranus Faxon; 

 three (one=Cat. No. 17692, U.S.N.M.), Stone Coal Creek, between 

 Buckhannon and Weston, West Virginia (U.S.F.C), on Camharus 

 ohscurus Hagen; one (Cat. No. 17693, U.S.N.M.), War Creek, head- 

 waters of the Big Sandy in McDowell County, West Virginia, on 

 Camharus duhius Faxon; five (3=Cat. No. 17G9-4, U.S.N.M.), Coney 



