172 Part III. Chapter ı. 
separate region, or mother country, as yet undiscovered, or they may have 
been produced by a rapid and unusual multiplication of flower-haunting insects. 
None of these propositions of SAPORTA satisfactorily explain the facts, The 
0 W.£Greem. 9 
Fig.2. Map illustrating position and extent of Land during the Cretaceous 
eriod, as wellas the Distribution of Land Plants. 
Eastern Dicotyledonous Vegetation, Kr Western Types of Vegetation. 635% Tropic 
le of Vegetation. Land Bridge, according to Ortmann, connecting northern South 
America, West Indies and Mexico with Tropic Vegetation, 5rs.. Very late Cretaceous and 
early Tertiary Submergence with ‘Formation of Caribbean Sea. 
