DISCONTINUOUS DISTRIBUTION, 65 



in more or less separated areas. Thus is produced the 

 phenomenon known as " discontinuous distribution." 



From the causes producing discontinuous distribution 

 it is evident that such a distribution will prevail amongst 

 pri??utive or vestigial types. The mudfishes were at one 

 time a widely scattered marine order of fishes, but at the 

 present day the only survivors are the vestiges of the race 

 which are found in various rivers. Amongst terrestrial 

 forms, one of the best instances is the archaic Peripatus, 

 which is found at the Cape, in New Zealand and Guiana, 

 but not in intermediate districts. 



