494 PROCEEDINGS OF THE NATIONAL MUSEUM vol.87 



ZELLERIELLA PISCICOLA Da Cunha and Penido 



Figure 48 



Da Cunha and Penido (1926) reported a Zelleriella in a "catfish" 

 from the Paraguay River. 



o 



FiGUBE 48. — Zelletiella piscicola Da Cunha and Penido: a, An ordinary individual; b, an individual in 

 division; c and d, pairs of nuclei after division; e, a pair of resting nuclei. Magnification not indicated. 

 (After Da Cunlia and Penido.) 



Measurements, in microns: Body length 70-110; body width 50-60; 

 cilia 10-12, longer in front, shorter behind. Nucleoli, 4 in number, 

 show individual constant differences from each other during mitosis, 

 but there are not two of each kind. (See the discussion of Protoopalina 

 caccosterni, p. 469, for interpretation.) 



ZELLERELLA ORIENTAUS Nie 



Figure 49 



Host: Microhyla ornata Boulenger, from Nanking, China. 



The outline of the body is roughly leaflike. It is broadest at the 

 anterior, which is slightly curved and somewhat obliquely truncated. 

 The posterior portion is the narrowest and terminates abruptly to a 

 minute sharp point. The cilia are arranged in many longitudinal or 

 slightly oblique rows. The cilia vary in length, those of the anterior 

 end are 14.1/x, while posteriorly they average 11.7/x. The two large 

 nuclei are ellipsoidal, one being located at the anterior half and the 

 other near the middle or at the posterior portion of the body. Each 

 nucleus contains eight (?) nucleoli in midanaphase. The chromosomes 

 are very distinct and more numerous than the nucleoli. The endo- 

 spherules are either rounded or dumbbell-shaped. 



Measurements, in microns: In a number of individuals length of 

 the body varies from 87.5 to 120, width of body 45.0 to 70, thickness 

 of body 19.6 to 32.2 ; diameter of nucleus from 12.5 by 9.6 to 16.0. The 

 measurement of the cilia line interval of one animal was 3.1 at the 

 anterior end, 4.5 in the middle portion, and 6.3 at the posterior end. 



