OPALINID CILIATE INFUSORIANS — METCALF 507 



Measurements, in microns: Body (a) 116 by 58, (b) 64 by 24, (c) 

 100 by 40, (d) 94 by 32. Other measurements from d: Nuclei 5.2, 

 6 by 5, 6.5 by 4, 6.2 by 4.8, 4.8 by 3; length of cilia 7.1; interval be- 

 tween lines of cilia 2.6. 



This Cepedea is somewhat like C. jujiensis but is only half as large, 

 has nuclei a little smaller, and is more diverse in form. It also some- 

 what resembles C. jormosae but is a third shorter, has nuclei of nearly 

 twice the dimensions, and, again, is of more diverse shapes. It 

 seems a distinct species but related to them both. 



CEPEDEA VIRGULA (Dobell) 



Opalina virgula Dobell, 1910. 



Host: Polypedates leucomystax (Gravenhorst). 



Dobell described as Opalina virgula opalinids from this host from 

 Ceylon. He very kindly sent me a shde. I have infections in two 

 specimens of this host from Tenasserim, Malay Peninsula (U. S. N. M. 

 Nos. 34515 and 34516), each 41 mm. long, and one infection from 

 Pulo Sianten, Anambas Islands (U. S. N. M. No. 26552), 70 mm. long, 

 a tremendously heavy infection. Comparing these with Dobell's 

 slide and description shows that they are the same and that they 

 should be assigned to the genus Cepedea. This genus had not been 

 created in the year 1910, when Dobell's paper appeared, and the 

 wrong classification was my own error. These Cepedeas are mostly, 

 but not always, unusually flat and might almost be regarded as 

 Opalinas of the subgeneric group Opalinae angustae, but comparison 

 with infections from other regions shows their affinities. A narrow 

 Opalina from Ceylon was an anomaly, for the narrow species of this 

 genus are North American or were derived from North America 

 (e. g., 0. obtrigona Metcalf, 1923a). The indications that this species 

 is a Cepedea therefore solve a difficult puzzle. 



CEPEDEA MOGYANA (Carini) 



Figure 66 

 Opalina mogyana Carini, 1937. 



Host: Hyla leucophyllata (Beiris), from Angra dos Reis, State of 

 Eio de Janeiro, Brazil. 



Of three specimens of this frog two were well infected with a dimi- 

 diata-like Cepedea. The fines of cifia are widely spaced, the nuclei 

 of medium size. The nuclei contain spherical masses of nucleolar 

 substance, which recafi Weill's species Opalina chattoni, but no 

 chromatin spireme, such as is in the latter species, was seen. 



Measurements in microns: Body (a) 144 by 48, (6) 122 by 30. 

 Other measurements from a: Nuclei 5.4, 4.5, 3.8; interval between 

 lines of cifia in the anterior part of the body 3.1. 



