236 



EDWARD W. BERRY 



The accompanying sketch map (fig. 4) shows the existing area 

 of distribution of the genus Engelhardtia in the Orient and Oreo- 

 munnea in the Occident in solid black. These areas are some- 

 what generalized and exaggerated in order to be visible on so 

 small a scale map. 



The areas where Tertiary species of Engelhardtia have been 

 found are covered by horizontal lining, and while not as extensive 

 as might be desired, indicate very clearly what was stated a few 

 paragraphs back, that forms closely allied to the modern Engel- 



Fig. 3 Engelhardtia (Oreomunnea) mississippiensis Berry, from the Lower 

 Eocene of Mississippi (natural size). 



hardtia were widespread during the Tertiary period when the 

 more extensive warm climate enabled them to penetrate more 

 than half way across the North Temperate zone. It seems 

 probable that they also pushed southward into the South Tem- 

 perate zone but we cannot verify or disprove this theory since 

 practically no fossil plants of Tertiary age have been discovered 

 in South America, Africa or Australia. Another probability is 

 that careful exploration will disclose the living representatives 

 of this widespread Tertiary stock in western Brazil, especially 

 as they have survived in Central America north of the equator. 



