OPALINID CILIATE INFUSORIANS — METCALF 



585 



0. natalensis Metcalf, in a ranid from the Sudan, is almost inter- 

 mediate between the ranarum-like species and the japonica-like 

 species. The nuclei are large, but the shapes of some individuals are 

 japonica-like. Other individuals are unique ia form. 



0. rotunda Metcalf, in Rana, from Siamese Cambodia, has numerous 

 individuals that more or less resemble 0. japonica, but its nuclei are a 

 little larger. 



0. annandali, new species, in Ranu, from Calcutta, India, has small 

 nuclei. Its posterior end is sometimes abruptly pointed. Its shape 



FiGUKE 141.— Geographic distribution of the Opalinae angaUae. 



is frequently irregular, as is true also of 0. natalensis and 0. rotunda. 

 These three might be regarded as related and as somewhat inter- 

 mediate between the japonica group and the ranarum group. 0. 

 zeylonica, new species, m a ranid from Ceylon, with small nuclei and 

 irregular shape, may also belong here. 



0. mantellae, new species, in Mantella (one of the Ranidae) from 

 Madagascar, has small nuclei, is ranarum-like m shape except for a 

 few small, narrow individuals. Its possible relationships are not 



suggested. 



6. chattoni WeHl, in Bujo, from CochincMna, has, in the cysts and 

 young forms only, peculiar nuclei with each a smgle large nucleolar 

 mass and a large, clear, chromatm skein. It seems a very distinct 

 species. 0. nucleolata, new species, in Rana, from Java, has usually 

 a single nucleolar mass in its nucleus, though sometimes two 

 are found. No such chromatm skem as in 0. chattoni is found 

 These species are probably related. Their nuclei are large and 

 their shape is like that of 0. ranarum. Two species of Rana from 



