THE OPALIXID CILIATE IXFUSORIAXS. 



211 



Their nuclei run larger than in the latter species, but this may well 

 be but a racial difference. 



Fig. 181. — Opalina copei, from Raxa pretiosa, X 117 diameters. 

 OPALINA TRIANGULATA, new species (fig. 182, p. 212). 



Type.— Vnited States National Museum Cat. No. 16610. 



Host. — Bufo lentiginosiis Shaw, three infections, from Auburn- 

 dale, Florida, March, 1912; N. R. Wood collector. The type infec- 

 tion is from United States National Museum specimen No. 48779. 

 64 mm. long. 



Measure?nenfss: A^of a large individual; B.. of a small individual — 



Measurements. 



Length of body 



Width of body 



Thickness of body 



Diameter of nuclei 0. 0034- 



Mean 



Diameter of endospherule 



Cilia line interval: 



Anterior 



Middle 



Posterior 



0.32 

 .175 

 .033 

 ,005 

 ,004 

 ,00125 



.00182 



.0021 



,0039 



0. 1435 

 .063 

 .016 

 . 00375 



00125 



This is another species whose broadest individuals approach in 

 shape the Opalinae latae. It comes rather close to 0. copei., also to 0. 

 hylaxena^ from georgiana^ but the general impression from the tri- 

 angulata infections is quite different from that given by an infection 

 of either of the forms mentioned. Some individuals of O. panamensis 

 are of similar shape, but they have much larger nuclei, averaging one 

 and one-half tnicra wider. 



