THE OPAUNID CILIATE INFUSORIANS. 



109 



This material is poorly preserved and the intranuclear phenomena 

 are not well seen. The form of the body is sufficiently well indicated 

 in the figures. In most individuals, even in some of the broadest 

 ones, there is a posterior point with rounded tip. In the ordinary 

 individuals we find two nuclei, each more or less elongated ellip- 

 soidal. In the daughter cells we see one similar nucleus, or a single 

 more elongated spindle-shaped nucleus, or two nearly spherical 

 daughter nuclei not connected by a thread. It seems then that 



Fig. 75. — Zelleriella cusconiSj x 460 diameters : a, an individual almost ready 

 FOR fission; b and e, cells of the usual sort; c and d, daughter cells; /, an 

 optical, longitudinal section of the body through one nucleus, showing thb 

 thickness of thb body. 



fission is consummated while the nuclei are ellipsoidal, nearly twice 

 as long as broad. 



In body form Zelleriella cusconis resembles Z. dendrohatidis 

 and Z. [houlenfferi], but its resting nuclei in ordinary individuals 

 are ellipsoidal and not spherical as in the latter two species. 



ZELLERIELLA BINGHAML new species. 



Type. — United States National Museum Cat. No. 16479. 

 Host. — Eleutherodactylus hinghami Stejneger, the type infection, 

 abundant, from United States National Museum specimen No. 49558, 



