OPAIilNID CILIATE INFUSORIANS — METCALF 



583 



Figure 139.— Geographic distribution of Cepedea, subgeneric group VI, B. 



Elongated Cepedeas occur, on the one hand, in Africa and Mada- 

 gascar, and on the other hand chiefly in lands once a part of or 

 accessible from the Cretaceous circum-Pacific land-strip. The 

 significance, if any, of this fact we do not discuss, for all grouping 

 within the genus is too faintly indicated to be worth much emphasis. 



Subgeneric Group VII 



C. plata, new species, in Hyla, Rio de Janeiro, Brazil. 



This species is so flat that it might be taken for an Opdina, but its 

 narrowness and the impression from the general shapes in the infec- 

 tions indicate that it is Cepedea. 



Species Not Assigned to Any Group 



C. fiava (Stokes) is omitted because of wholly inadequate descrip- 

 tion. Four species, described by others, I have not seen and so hesi- 

 tate to place them in any of these groups: 



C. scalpriformis (Ghosh), in Bufo, India. 

 C. sialkoti Bhatia and Gulati, in Bufo, Punjab, India. 

 a metcalfi Bhatia and Gulati, in Bufo, Punjab, India. 

 C. punjabensis Bhatia and Gulati, in Bufo, Punjab, India. 



Opalina (figs. 140 and 141).-The genus Opalina we have divided 

 into (1) broad species, found in the Eastern Hemisphere, with some 

 emigrant species that have penetrated to North America and are now 

 living on the Pacific coast, west of the moimtains and m the tropical 

 lands to the south, often called Central America, and (2) narrow species 

 which I have suggested were developed m the Hylas after they 



