200 



BULLETIN 120, UXITED STATES NATIONAL MUSEUM. 



form, but no living material has been available. The shape, however, 

 is so characteristic as clearly to justify regarding this as a distinct 

 species. i 



OPALINA DISCOPHRYA (?). 



A specimen has been deposited with the United States National 

 Museum as No. 16540. 



Host. — Bufo copel Yarrow and Henshaw, six infections from 

 northern and northeastern Canada: The type infection is from 



Fig. 169.- — Opalixa discophrya (?) from Bufo copm : a, a bit of the body X 460 



DIAMETERS ; I) AXD C, MAGNIFIED 117 DIAMETERS. 



United States National Museum specimen No. 5388, from East Hud- 

 son's Bay; C. Drexler, collector. 



M easurevients of an ordinary individual. — Length of body, 0.4 

 mm. ; width of body, 0.16 mm. ; thickness of body, 0.03 mm. ; diam- 

 eter of nucleus, 0.00046 mm. to 0.00575 mm. ; length of endospherule, 

 0.0025 mm. ; width of endospherule, 0.002 mm. ; cilia line interval, 

 anterior, 0.0022 mm., middle, 0.0035 mm., posterior, 0.005 mm. 



This infection from another Bufo from a very different locality 

 shows in some individuals a shape similar to that of O. discophrya 

 from Bufo cognatus., and its measurements quite agree, except the 

 size and shape of the endospherules. It might be better to recognize 

 it as a distinct subspecies. 



OPALINA PICKERINGII, new species. 



Tyije. — United States National Museum No. 16545. 

 Host. — Hyla pickeringii (Holbrook), numerous infections from 

 Oberlin, Ohio, Raleigh, North Carolina, District of Columbia, and 



