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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 87 



of ranarum-]jke forms it is diflBcult, probably impossible, to give any 

 classification that will express relationship. Forms of similar appear- 

 ance are not necessarily genetically close together. 



riGUEE Q2.—0palina ranarum orbkulata, new subspecies, from Rana glandulosa: a, X 673; 6, X 78. 



Measurements, in microns: Body 230 by 160, 180 by 100; width of 

 body (in another specimen) 80; nuclei 6.4, 5.4, 4.9, 4.3; length of cilia 

 12.9; interval between lines of cilia 2.3. 



FiQVRE 93. — Opalina ranarum orbkulata from Rana temporalis: a and 6, X 78; c, X673. 



