THE OPAL.INID CILIATE INFUSORIANS. Ill 



This seems a species quite distinct from those described, its bod}' 

 form and nucleus form being characteristic. 



ZELLERIELLA [TRINITATISl, new species (?). 



A specimen of this form has been deposited with the United 

 States National Museum as Cat. No, 16494. 



Host. — Phyllohates trinitatis Garman, two infections, the type in- 

 fection from United States National Museum specimen No. 27792, 

 23 mm. long, from La Guaira, Venezuela, July 10, 1900, Lyon and 

 Robinson, collectors, and another from San Juan, Venezuela. 



Measurements of an ordinary individual. — Length of body 0.098 

 mm. ; width of body 0.053 mm. ; diameter of nucleus 0.015 mm. ; 

 diameter of endospherule 0.0015 mm. ; cilia line interval, anterior 

 0.00175 mm., posterior 0.0027 mm. 



This form rather closely resembles ZeJleriella cusconis, except 

 that its nuclei in the resting condition are spherical. As the material 



a o 



Fig. 77. — Zelleriella [trinitatis], X 460 diameter.s. 



from both infections is poorly preserved, the nuclei being often 

 shrunken and evidently not normal, it is best to attempt no definite 

 classification and to name it only provisionally. 



ZELLERIELLA HYLAXENA, new species. 



r?/;?e.— United States National Museum Cat. No. 16480. 



Host. — Hyla fulcheUa Dumeril and Bibron, one infection, in 

 United States National Museum specimen No. 5407, 30 mm. long, 

 from Paraguay; Captain Page, collector. 



Measurements of an average individual. — Length of bod}^ 0.111 

 mm. ; width of body 0.065 mm. ; thickness of body 0.024 mm. ; diame- 

 ter of resting nucleus 0.0152 mm. ; diameter of endospherule 0.002 

 mm. ; cilia line interval, anterior 0.00155 mm., posterior 0.00285 mm. 



The body of this species is unusually thick for a Zelleriella.^ its 

 thickness being over one-third of its width. In the ordinary in- 

 dividuals the nuclei are spherical, or nearly so. In somewhat 

 larger forms, preparing for division, the nuclei are a little elongated. 

 In individuals ready for fission the two nuclei are dumb-bell-shaped 

 with the constricted part of the dumb-bell narrow and rather long 



