76 



DE. E. A. XEWELL AEBEE OX THE [April 1914, 



2. CoEDAICLADrS sp. (PL XIII, fig. 1.) 



A large specimen, showing a somewhat obscure impression of 

 what I take to be the bark of a Cordaitean tree, occurs in the 

 Mattice Hill cores, part of which is figured in PL XIII, fig. 1. It 

 is quite unlike any British example of Cordaicladus known to me. 

 The leaf-scars (or, rather, the prints which I interpret as being 

 probably leaf-scars) are either horizontal or somewhat oblique, but 

 not curved, grooves, which are fairly distant one from the other. 

 They are certainly different in form from the ordinary Cordaitean 

 leaf-scar, and there is no cushion. The exact nature of this fossil 

 remains, however, doubtful for the present. 



XIV. COXCLTJSIOXS AS TO THE PaLJEOBOTAXICAL HOEIZOXS 

 EEPBESEXTED IX THE KEXT COALEIELD. 



The number of species known from the Kent coalfield has risen 

 from ten in 1892 to twenty-six in 1909, and is now ninety-six, 

 excluding varieties and incomplete determinations. Sixty-eight new 

 records are included in the present paper. Thus, including all deter- 

 minations, nearly a hundred plants are now known from Kent, 

 either genericaily or specifically. Of these, twenty-nine species 

 occur in both the Transition and the Middle Coal Measures, and 

 twelve only in the higher, with fifty-five in the lower horizon alone. 

 The occurrence of species, confined to a single horizon, is, however, 

 a matter of secondary importance, as compared with the relative 

 abundance of certain common types, as an indication of the zone. 

 The frequencj^of occurrence of all the plants recorded in the present 

 paper has been indicated in the lists of records from each boring 

 given in the preceding pages. I now give a complete list of all the 

 fossil plants at present known from the coalfield, including those 

 recorded in previous papers by Prof. Zeiller and by myself, and 

 an indication of their distribution in the two horizons present in 

 Kent. 



A Complete List of the Known Fossil Floras of the 

 Coal Measures of Kent. 



Species. 



Transition 



Coal 

 Measures. 



Middle 



Coal 



Measures. 



Equisetales. 



Calamites cisti Brongn 



X 

 X 

 X 



X 

 X 



X 

 X 

 X 

 X 

 X 

 X 



C. ramosKs Art 



C. suclcoici Brongii 



C. varians Sternb 



C undulatus Sternb 



C. qcepperti Ett 



Dictyocala m ites bu rri Arber 





