486 PROTOZOOLOGY 



Genus Protoopalina Mctcalf. Cylindrical or spindle-shaped, 

 circular in cross-section; 2 nuclei; in rectum of various species of 

 Amphibia with one exception. Numerous species. 



P. intestinalis (Stein) (Fig. 225, a-d). About 330^ by 68^; in 

 intestine of Bomhina bomhina, and B. pachypa, Europe. 



P. saturnalis Leger et Duboscq (Fig. 225, e, /). In intestine of 

 the marine fish, Box hoops; 100-152)U by 22-60^. 



P. mitotica (M.) (Fig. 225, g). 300m by 37^; in intestine of 

 Amhy stoma tigrinum. 



Genus Zelleriella Metcalf. Greatly flattened; 2 similar nuclei; 

 all in Amphibia. Numerous species. 



Z. scaphiopodos M. (Fig. 224, h). In Scaphiopus solitarius; 

 about 150m long, 90/x broad, 13m thick. 



Z. antilliensis (M.). About 180m long, 113m wide, 32m thick; in 

 Bufo marinus. 



Z. hirsuta M. About 113m long, 60m wide, 22m thick, in Bufo 

 cognatus. 



Z. intermedia M. (Fig. 61). About 94m by 50m ^y 16m; in Bujo 

 intermedicus and B. valliceps. 



References 



BtJTSCHLi, 0. 1887-1889 Protozoa. In: Bronn's Klassen und 



Ordnungen des Thier-reichs. Vol. 1. 

 DoFLEiN, F. and E. Reichenow 1929 Lehrbuch der Protozoen- 



kunde. Jena. 

 Kahl, a. 1930-1935 Urtiere oder Protozoa I : Wimpertiere odcr 



Ciliata (Infusoria). In Dahl: Die Tierwelt Deutschlands und 



der angrenzenden Meeresteile nach ihren Merkmalen und nach 



ihrer Lebensweise. Parts 18, 21, 25, 30. 

 Kent W. S. 1880 to 1882 A manual of Infusoria. 

 Stein, F. 1867 Der Organismus der Infusionsthiere. Vol. 2. 

 Stokes, A. C. 1888 A preliminary contribution toward a history 



of the fresh-water Infusoria of the United States. Jour. 



Trenton Natural Hist. Soc, Vol. 1. 



Metcalf, M. M. 1923 The opalinid ciliate infusorians. Smith- 

 sonian Inst. U.S. Nat. Museum, Bull., No. 120. 



