OPALINID CILIATE INFUSORIANS — METCALF 



469 



the only ones found, they would probably have been thought to be 

 Zelleriellas. Indeed I so labeled the unstamed specimens. Probably 

 the host was dead some time before it and the parasites were preserved. 

 This species is very distinct from any of the other Australian species 

 described. It resembles P. intestinalis and P. hylarum and is classed 

 with them in the subgeneric group ii, which contains the parasites 

 characteristic of the bell toads. 



PROTOOPALINA BORNEONENSIS, new species 



Figure 23 



Type: U.S.N.M. No. 22622. 

 Host: Polypedates reinwardtii (Boie), U.S.N.M. 

 Borneo. 



No. 57819, from 



Figure 2Z.—Protoopalina borneonensis, new species, X 124 and 505. 



Measurements, in microns: Large specimen, 200 by 36; medium 

 individual, 140 by 40 ; small specimen, 89 by 30 ; nucleus of medium 

 individual, 17 by 8.5; cilia length, 9.1; ciHa line interval in posterior 

 half of body, 4.1. This species somewhat resembles P. africana 

 Metcalf. 



"PROTOOPALINA CACCOSTERNI" Fantbam 



Figure 24 



Host: Cacosternum boettgeri (Boulenger), tadpole, from Johannes- 

 burg, South Africa. 



Measurem^ents, in microns: Length of body, 37.3-63.6; width of 

 body, 6.4-11 ; length of nucleus, 6-8 ; v/idth of nucleus, 2-3. Nucleoli 

 "3" in each end of the nucleus when found in an anaphase of mitosis. 



This odd number of what appear to be daughter nucleoli seems incon- 

 sistent with the derivation of half the number of nucleoli from the 

 male and half from the female, and observation of the sexual phenom- 

 ena in several species of opalinids seems to have shown that the male 



