THE OPAL.INID CILIATE INFUSORIANS. 



125 



Measurements: A^ of a long, narrow individual; B, of a hroad 

 individual — 



Length of bod v 



Width of body 



Diameter of nucleus. 

 Cilia line interval: 



Anterior 



Posterior 



Measurements. 



imn. ' vnn. 



0. 132 0. 1 



. 063 . 076 



.0124 .0135 



.0023 

 .0036 



Dividing animals were not found in either infection, nor can 

 internal nuclear structure be well studied. It seems best merely to 



^ c 



Fio. 91. — Zelleriella [of Bufo poxctatds], X 460 diametebs. 



label this form temporarily for reference until more satisfactory 

 material is available for study. 



ZELLERIELLA [of BUFO STERNOSIGNATUS], new species (?). 



A specimen of this form has been deposited in the United States 

 National Museum as Cat. No. 16489. 



Host. — Bufo stemosignatus Keferstein, three scant infections 

 from Tehuantepec, Mexico, collected by F. Sumichrast. One of these. 



