MB HIEKN, ON EBENACE^E. 



273 



no way to confirm them in their present places ; but since they have been published as 

 Ebenaceous, I quote them as they stand, with the addition, in some cases, of additional 

 particulars and remarks ; I have added the synonymy in accordance with the views of the 

 principal authorities in fossil botany, and have drawn up artificial keys for the genera, 

 and also for the species in each genus, in order to set forth the distinctive characters 

 of the genera and species, so far as their published descriptions allow, and to found a 

 basis for their systematic arrangement. 



KEY TO THE FOSSIL GENERA. 



Leaves small, not exceeding 1 in. long, midrib alone robust. L KOYENA. 



Leaves exceeding 1 in. long ; lateral veins more or less clearly marked. 

 Calyx 4 5-merous. 



Leaves narrowly elliptical, 3 4 in. long, narrowed at both ends. II. EUCLEA. 

 Leaves ovate lanceolate oval or oblong or exceeding 4 in. long. III. DIOSPYROS. 

 Calyx 3-merous. IV. MACREIGHTIA. 



Diospyros hceringiana, Ettingsh. has narrowly elliptical leaves 2 3|in. long, but it 

 was published previously to the reference of any fossil to the genus Euclea. Fossils 

 with a trimerous calyx, especially if the foliage is Ebenaceous, have been referred by 

 authors to Macreightia, a genus which I have merged in the older genus Mdba; if 

 then they still merit reference to a recent Ebenaceous genus, they must all be included 

 under the genus Maba. 



I. KEY TO THE FOSSIL SPECIES OF EOYENA. 

 Leaves linear, in. broad. 

 Leaves oblanceolate or wider, J Jin. broad. 

 Leaves oblanceolate or oblong, 1 in. long. 

 Leaves oblanceolate. 

 Leaves oblong. 



Leaves oval or round, | in. long. 

 Leaves cuneate-orbicular. 

 Leaves oval. 



1. B. Myosotis. 



2. E. grceca. 



3. M. AmalthecB. 



4. R. euboea. 



5. It. Pentelici. 



VOL. XII. PART I. 



