NO. 3668 PTERODRILUS—HOLT 19 
gland lies so that the true extent and appearance of the prostate is 
obscured. The ejaculatory duct is markedly longer than that of the 
unusually short one of P. mezxicanus and is expanded along its mid- 
length. The bursa is small and ovoid, intermediate in size between 
those of P. alcicornus and P. distichus, and much _ smaller 
that of P. mexicanus. 
‘ 
Ficure 4.—Pterodrilus hobbsi: a, lateral view of reproductive systems; b, en face view of 
jaws, upper jaw above; c, animal from Lee County, Va. 
