THE OPALINID CILIATE INFUSORIANS. 



243 



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mm. by 0.0055 m.; length of endospherule 0.0014 mm.; width of 

 endospherule 0.0011 mm.; cilia line interval, anterior 0.00125 mm. 

 posterior not much greater, but not clear enough to measure. 



This Opalina is one of three forms found in this oriental toad. Its 

 chief diagnostic characters are, 1, the ellipsoidal nuclei (improperly 

 drawn in this figure) ; 2, the small, elongated endospherules ; 3, the 

 rather long and very crowded cilia ; 4, the slight difference in density 

 of ciliation between the anterior and the posterior ends of the body. 



Fig. 219. — Opalina [bufoxena], x 460 diametees. Note in 5 the irubgdlak distki- 

 bdtion of the few nuclei and of the few endosphhb.ules. all the nuclei and 

 endospheuules observed are drawn. the individual is apparently abnormal. 



In figure 219, h, is shown an individual many of whose nuclei seem 

 to have degenerated. Smaller nucleuslike bodies are present, but are 

 not well stained. The large nuclei present are not spheroidal as 

 drawn, but are slirunken and of irregular contour. The irregular 

 distribution of the few endospherules is an indication that tlie indi- 

 vidual is abnormal. 



It seems possible that this may be but a form of 0. asiatica. It is 

 found in the same host and its dense ciliation resembles that of the 

 latter species. In both the endospherules are small. The chief dif- 

 ference is in the normal nuclei, these being very small and spherical 



