52 



OSBORN. 



tralia and New Zealand. Such a connection strengthens 

 the conception announced by Huxley in 1868, that the 

 zoological regions were mainly upon lines of latitude, rather 

 than as suggested by the present configuration of the earth, 

 upon lines of longitude. With the theoretical elevation of this 

 submerged continent (Fig. II), which may be called the '* Ant- 



F'lG. II. — Restoration of Antarctica by elevation to the 3040 sounding line, 

 showing old continental lines and greater depth between Africa and Antarctica. 



arctic Region," so as to connect the southern land masses at 

 various times, all present and past geographical distribution of 

 mammals may be theoretically accounted for. Elevation to the 

 10,000 foot (3040 meter) line still leaves a broad channel south 

 of Africa. Without such ele\'ation we are still met by many 

 insuperable difficulties. 



