484 



PROTOZOOLOGY 



0. hylaxena Metcalf (Fig. 224, a). In Hyla versicolor; larger 

 individuals about 42{)/i long, 125/x wide, 28/i thick. Several sub- 

 species (Metcalf). 



0. ohtrigonoidea M. (Fig. 224, b-f). 400-840^ long, ITS-lSO/z 

 wide, 20-25yu thick; in various species of frogs and toads (Rana, 

 Hyla, Bufo, Gastrophryne, etc.). North America. Numerous sub- 

 species (Metcalf). 



Fig. 224. a, 3 individuals of Opalina hylaxena, X230; b-f, 0. oh- 

 trigonoidea, X60 (b, c, from Bufo fowleri; d-f, from Rana pipiens); 

 g, Cepedea cantabrigensis, X230; h, Zelleriella scaphiopodos, X230. 

 (All after Metcalf.) 



0. carolinensis M. 90-400ju by 32-170;u; in Rana pipiens spheno- 

 cephala. 



0. pickeringii M. 200-333At by 68-100^; in Hyla pickeringii. 



0. oregonensis M. o26/x by 123)u; in Hyla regilla. 



0. spiralis M. 300-355m long, 130-140m wide, 25-42m thick; in 

 Bufo compactilis. 



0. chorophili M. About 470m by lOOju; in Chorophilus triseriatus. 



0. kennicotti M. About 240/i by 85^; in Rana areolata. 



