98 STUDIES IN GEOLOGY, No. 4 



Doliocarpus has not otherwise been recorded as a fossil but 

 leaves of this type present in the Eocene of the Southern 

 United States have been referred to the form genus 

 Dillenites. The latter are abundant and characteristic. 



Doliocarpus has about 20 existing species confined to the 

 South American tropics and mostly Brazilian. The allied 

 genus Tetracera is probably descended from the same Dillen- 

 ites stock. Tetracera contains numerous species of trees and 

 lianas of all tropical lands, largely represented in the Ama- 

 zon basin. 



The family Ochnaceae is represented by a single species of 

 Ouratea similar to the Brazilian species Ouratea multiflora 

 Pohl. The genus has about 120 existing species, 90 of which 

 occur in the American tropics and the balance in the cor- 

 responding part of the Old World. The family is a small 

 one of 17 genera and about 210 species, mostly trees. There 

 are 125 species and 9 peculiar genera, three of which are 

 monotypic, in the American tropics, and 82 species and 6 

 peculiar genera in the Oriental tropics. The genera Ouratea 

 and Sauvagesia are common to both. The former is repre- 

 sented by distinct subgenera in the two regions and the latter 

 comprises herbaceous or ericaceous like shrubs and probably 

 is modern. . The family evidently has a geological history, 

 but is practically unrepresented in the known geological 

 record. 



The family Flacourtiacese is a rather large one in the 

 modern flora with over 500 species in 70 or more genera, 

 largely wanting in the known geological record. It has no 

 living species in North America or Europe and is mainly 

 tropical in its habitat, although not strictly so, and many 

 species are montane forms. The family is represented by 6 

 species of the genera Banara, Patrisia, Casearia and Lsetia in 

 the Chilean fossil flora. The Banara is very similar to 

 Banara nitida Spruce of eastern Peru and belongs to a 

 genus with about 18 existing species ranging from the An- 

 tilles and Mexico to Bolivia and southern Brazil. The 3 



