OPALINID CILIATE INFUSORIANS — METCALF 



511 



Two out of five specimens, 22 mm. long, were infected with a 

 rather flat Cepedea. Its nuclei are very small, their diameter about 

 equal to the interspace between the lines of cilia. C. rubra is longer 

 than C. dimidiata of any subspecies. In C. paraguensis (Metcalf's 

 C. dimidiata paraguensis, 1923a) the smallest nuclei are about as large 

 as the largest in C. rubra, but the larger are twice as large as the usual 

 ones in the latter species. The appearance of the infections as a 

 whole in the two species, the shapes, and the percentages of indi- 

 viduals of the several shapes, are different. 



Measurements, in microns: Figure 68, a, width of body 34.6, 

 nucleus 3.1, 2.1, dividing nucleus 7.6 by 1.7; length of cilia 7.7; cilia 

 line interval 2.7. Figure 68, b, body 200 by 23. Figure 68, c, body 

 90 by 12. 



CEPEDEA RUBRA (Carini) 



Figure 69 



Host: Pseudopalvdicola ameghini (Cope), from Minas Geraes, 

 Brazil, 7 specimens, 4 uninfected, 3 showing heavy infections. 



FiGUBE 69— Cepedea rubra (Carini) from Pseudopaludkola ameghini: a and 6, X 249; c, X 1010. 



These frogs were all dead, perhaps 18 hours or so, before they were 

 opened. Probably in consequence of this, the Cepedeas were very 

 slow in their movements and were much twisted spirally. These 

 belong to the group of more or less elongated species with soft pellicle 

 and soft bodies. They so intergrade as to be difficult to distingmsh. 

 The present specimens seem the same as the forms in Hyla mmuta. 



Measurements in microns: (a) Body 200 by 30; (6) body 90 by 17; 

 (c) body 64 by 22; nuclei 3.4, 3, 2.7; dividing nuclei 4.9 by 3. 



