OPALINID CILIATE INFUSORIANS — METCALF 



541 



Figure 109. 



-Opalina oblrigonoidea Metcalf from Rana palusMs, X 4G0 except the small figure, which Is the 

 outline of a nucleus in division X 1010. 



Figure 110.— Opalina oblrigonoidea lorma lata Nie from Kaloula boreulis: a, X 294; 6, X 70. 

 OPALINA OBTRIGONOIDEA forma LATA Nie 



Figure 110 



Host: Kaloula borealis Barbour, from Nanking, China. 



The body is orbicular in form and somewhat broader at the anterior 

 end. It is almost as long as broad. The cilia are of moderate length 

 and evenly arranged in numerous longitudinal rows. The pellicle is 

 fairly thick and bears longitudinal grooves running throughout the 

 length of the body. Beneath the pellicle is the layer of ectosarc, 

 which has a vacuolar appearance. 



Measurements, in microns, of a number of individuals: Body length 

 varies from 80.6 to 245.0, width from 61.9 to 200, nucleus 4.1 to 4.2; 

 the cilia line interval for one animal measured 3.3 anteriorly and 4.6 

 posteriorly. 



The shape of the body of this forma is quite different from that of 

 the type, although they are found in the same host and the size of the 

 nuclei are nearly the same. 



