190 BUI,LETIN 120, UNITED STATES NATIONAL MUSEUM. 



lively calling this form O. intermedia^ because of its shape interme- 

 diate between that of O. ohtrigonoidea and that of 0. rananwi. 

 Fuller comparison of all species indicates it is preferable to assign 

 these forms to the species ohtrigonoidea, recognizing the giant forms 

 as a subspecies. 



V) U 



Fig. 158. — Opalixa obtrigoxoidea maxima, from Bui'O iiALorHiLus. X 117 diameters. 

 OPALINA OBTRIGONOIDEA LATA, new subspecies. 



Type.— UmtQ^ States National Museum Cat. No. 16563. 



Host. — Rana aurora Baird and Girard, one infection, from United 

 States National Museum specimen No. 39871, 58 mm. long, a female 

 with eggs, from Crater Lake, Oregon, August 21, 1896; Everman 

 and Cox collectors. 



Measur^ements of a good sized individual. — Length of body 0.256 

 mm. ; width of body 0.12 mm. ; thickness of body, anterior 0.019 mm.. 



