214 BERRY— LOWER EOCENE FLORA OF [April 25, 



with about 60 species, is common to Asia and South America ; and 

 the genus Dillcnia with about 25 species ranges from Asia to Aus- 

 traha ; so that on the whole the family is prevailingly oriental in the 

 existing flora. 



The fossil record is unfortunately most incomplete, illustrating 

 however a wider range of the genera in the past in response to milder 

 climatic conditions in both the north and the south temperate zones 

 during the Tertiary, and also the fact that several of the modern 

 American genera have been American throughout their known geo- 

 logic history. Thus Empcdoclea with two existing South American 

 species, sometimes made a subgenus of Tetracera, has a fossil form 

 in the eary Tertiary of Chili. The genus DoHocarpus with about 20 

 recent species also in the South American tropics has two fossil 

 forms in the early Tertiary of Chili. The genus Daz'illa with 25 

 modern species in tropical America is doubtfully represented in the 

 Wilcox flora by Calycites daznUaformis Berry. 



The genus Sanranja with 60 modern species in South America 

 and Asia has a species in the Paleocene of France, another in the 

 Ypresian of the south of England and a third in the Miocene of 

 Croatia. 



The genus Dillenia with 25 existing species confined to Asia and 

 Australia is represented by a form in the Paleocene of Belgium and 

 by some of the Wilcox species referred to the form-genus Dillenites. 

 The genus Tetracera with 40 recent species found in all tropical 

 lands, has two fossil species in the early Tertiary of Chili, another in 

 the Pliocene of Java and is represented in the Wilcox flora by some 

 of the species of Dillenites. I have recognized five well-marked 

 species of Dillenites in the Wilcox and these appear to represent 

 modern forms of both Dillenia and Tetracera. 



Conwenz described three species of Hibbertia, a large Australian 

 genus, in the Baltic amber (Sannoisian) but Schenk considered that 

 they did not belong to either this genus or even the family. 



The family Ternstroemacese (Theacese) contains about 16 genera 

 and 175 existing species mostly tropical but extending into the north 

 temperate zone in North America and eastern Asia (Thea, Gordonia 

 and Stewartia). The following seven out of the sixteen genera are 

 confined to a single area : Bennetia Martins with five species inhabits 



