THE OPALINID CILIATE INFUSOEIANS. 



107 



Measurements of an ordinary hinucleated individual. — Length of 

 body 0.2 mm,; width of body 0.115 mm.; thickness of body 0.021 

 mm. ; length of nucleus 0.024 mm. ; width of nucleus 0.017 mm. ; 

 length of cndospherule 0.0024 mm. ; width of endospherule 0.0016 

 mm. ; cilia line interval, anterior 0.00161 mm., posterior 0.0035 mm. 



This is a large ZeUeinella which, except dtiring and after division, 

 has about the form shown in figure 73. The mitotic condition of the 

 broadly ellipsoidal nuclei seems to be a granular prophase, but I sus- 

 pect that all the nuclei are abnormal, probably because of abnormal 

 environmental conditions before their preservation. All the elon- 



Fig. 73. — Zelleriella darwinii, a cell op the usual sort, X 460 diameters. 



LINES OF insertion OF CILIA ARE SHOWN. 



Two 



gated nuclei seen in dividing individuals or daughter cells, as well as 

 the more spheroidal nuclei of the ordinary individuals, show an ir- 

 regularly granular condition of the chromatin which is different 

 from the normal conditions of the nuclei of other species in the cor- 

 responding phases. Fission evidently is consummated while the 

 nuclei are elongated ellipsoidal, or almost spindle-shaped. 



ZELLERIELLA CUSCONIS, new species (fig. 75, p. 109). 



Type.— United States National Museum Cat. No. 16478. 



Host. — Eleutherodactylus footei Stejneger, one infection, from 

 United States National Museum specimen No. 49563, 19 mm. long, 

 from Cuzco, Peru, 11,500 feet altitude, July 9 ; Yale Peruvian Expe- 

 dition, collectors. 



