THE OPALINID CILIATE INFUSOEIANS. 



81 



mm. ; cilia line interval, anterior 0.002 mm., posterior 0.0027 mm. 

 Probably six massive chromosomes. 



This rather small species is sharp pointed posteriorly, except in 

 swollen individuals about to divide by fission, in which the posterior 

 end is usually rounded {b in fig. 50). Quite divergent conditions as 

 to mitosis are found, each of the states figured being seen. 



This species seems a little more advanced in the average mitotic 

 state of its nuclei, because of the considerable number found in the 

 condition shown in figure 50, a and h, almost four-nucleated forms. 



Fig. 50. — Pkotoopalina formosae, x 4G0 diameters : a and i, the usdal condition ; 



C, AN OLD daughter CELL ; d, A YOUNG DAUGHTER CELL. 



The number of massive chromosomes seems to be six. At least in 

 a number of nuclei this is the number of chromatin masses. 



PROTOOPALINA QUADRINUCLEATA, new species. 



Type. — United States National Museum Cat. No. 16457. 



Host. — Rana macrodon Tschudi, one infection in United States 

 National Museum specimen No. 43931, 75 mm. long, from Mount 

 Salok, Java, May, 1909 ; Bryant Expedition, collectors. 



Measurements of an average individual. — Length of body 0.163 

 mm. ; width of body 0.02 mm. ; length of nucleus 0.012 mm. ; width of 

 nucleus 0.00652 mm. ; length of endospherule 0.0015 mm. ; width of 

 endospherule 0.001 mm.; cilia line interval, anterior 0.0015 mm., 

 posterior 0.00215 mm. Massive chromosomes probably four in 

 number. 



