OPALINID CILIATE INFUSORIANS — METCALF 



499 



located in the middle of the body, measure 12-15/x in diameter; they 

 are 15-20/* apart. The nucleolar substance is either in the form of a 

 compact block or oftener in the form of irregularly distributed blocks 

 adjacent to the nuclear membrane. 



This snake feeds on anurans, and it is possible that this is merely an 

 adventitious infection. (The description of this species is not suffi- 

 cient to allow comparison with other species and determination of its 

 affinities.) 



ZELLERIELLA JAEGERI Carini 



Figure 56 



Host: A snake, Liophis jaegeri (Giinther), from Brazil. 



The body is oval, greatly flattened. This species of Zelleriella 

 averages 60-73/^ in length and 34-42)Li in width. Two spherical or 

 sUghtly oval nuclei are found in the midregion of the body, measuring 

 10-12jLi in diameter. They are 5-8/* apart. 



PiGTJEE bQ.— Zelleriella jaegeri from Liophis jaegeri, X ca. 560. (After Carini.) 

 ZELLERIELLA ARTIGASI Unti 



Host: Bujo marinus (Linnaeus), from Brazil. 



The body is oval and flattened, measuring 60-70/x in length and 

 30-40/i in width. The shape of the body in the majority of the 

 specimens is that of an egg of Schistosoma mansoni. Characteristic 

 of this species is the presence of a transparent tail, which is 

 devoid of cilia. Both nuclei are spherical, measuring on the average 

 9-12/i; they are 6-7 n apart. Within each nucleus one, two, or three 

 nucleoK of different shapes are found adjacent to the nuclear mem- 

 brane. 



ZELLERIELLA species (7) 



« Figure 57 



Host: Elosia lateristrigata Baumann. Of six specimens from AngTa 

 dos Reis, State of Rio de Janeiro, Brazil, two were infected. 



