THE OPALIXID CILIATE INFUSORIANS. 



301 



islands today, and in New Zealand the only Anura are two species of 

 Liopelma, a Leptodactylid. Arldt's map (fig. 234, A) shows as 

 doubtful a Cretaceous trans-Pacific bridge, south of the Equator, 

 from South America to Australasia, including New Zealand. We 



^<, ^ s 



2 fc 



have shown this bridge in the late Cretaceous (fig. 235, A), united 

 with central South America, but not with southern South America, 

 and we have not shown it as united to New Zealand. Evidence for 

 these suggestions will appear later in our discussion of the distri- 

 bution of the Hylidae and the Leptodactylidae (see also page 300). 



