THE OPALINID CILIATE INFUSORIANS 



233 



third 0.0042 mm. by 0.0042 mm., fourth 0.004 mm. by 0.003 mm., 

 fifth 0.0048 mm. by 0.0034 mm., sixth 0.0055 mm. by 0.004 mm., 

 seventh 0.006 mm. by 0.0035 mm. ; diameter of endospherule 0.0016 

 mm. to 0.002 mm. ; cilia line interval, anterior 0.0018 mm., posterior 

 0.0031 mm. 



Fio. 206. — Opalina japonica, from Rana japonica, X 117 diamktius. 



This eastern Opalina differs from O. ranarum in having many 

 individuals with the posterior end abruptly sharp pointed. A few 

 have a virguloid form never observed in O. ranai'um. Also many 

 of the nuclei are more elongated, and some of these do not give in- 

 dication of being in active motosis. The nuclei, too, run much 

 smaller than in 0. ranarum. The species seems distinct. 



OPALINA JAPONICA (?). 



A specimen of this form has been deposited with the United States 

 National Museum as No. 16617. 



riG. 207. — Opalina japonica o, from Kana i.imnocharis, X 460 diamktbe3. 



Host. — Rana limnocharis Wiegmann, one infection, from United 

 States National Museum specimen No. 44158, 35 mm. long, from 

 Mount Gede, Tjibodas, Java, August, 1909; Bryant Expedition, col- 

 lectors. 



83103—23- 



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