Qu 
CERTAIN DICOTYLEDONOUS AND CONIFEROUS LEAVES. 26 
are quite sufficient to warrant its specific separation, though they are 
differences of degree, rather than kind, and in so far as epidermal structures 
are evidence, it appears to be a synthetic form combining many of the 
characteristics of Taxodium distichum and of Glyptostrobus heterophyllus, 
which seem, as far as cuticular structure goes, to have diverged from it in 
two different directions, Gilyptostrobus adopting the rosette type of pore, and 
Taxodium distichum the quadrangular type, both of which occur in the 
fossil form. 
SUMMARY. 
In the first part of this paper three distinct species of dicotyledonous 
leaves are described from their cuticular structures for the first time, 
namely: Dieotylophyllum Stopesti, D. spiculatum, and D. sinuatum. The 
name “ Dicotylophyllum” is proposed for dicotyledonous leaves of uncertain 
affinity. The line of attack followed, in the attempt to obtain some insight 
into the flora, is the investigation of the cuticular structure, since that gives 
the next best results for comparison when the state of preservation of the 
material precludes the examination of the internal tissues. 
In the consideration of the cuticles of the leaves selected, the features 
chosen for comparison are those visible in surface views, for in the case of 
the present material it was found to be impossible to obtain good sections 
through the cuticles. 
The second half of the paper deals with the cuticles of certain gymno- 
spermous fossil leaves. They are compared with known recent and fossil 
forms. Araucarites Göpperti appears to be a true Araucaria and far more 
closely resembles A. excelsa than A. Cunningham. 
Taxodium europeum appears to resemble both Taxodium distichum and 
Glyptostrobus in its cuticular structure, which is quite different from that of 
the recent and fossil Sequoias. Hence it is very unlikely to be a poly- 
morphic form of Sequoia, and shows most likeness to the genus Tazodium. 
Sequoia Tournalii is seen to be less like Sequoia sempervirens in its cuticular 
structure than its external form would lead us to suppose, and its present 
position must be regarded as still open to question, though its cuticular 
structure shows certain points of likeness to that of Sequoia sempervirens. 
ACKNOWLEDGMENTS. 
My most grateful thanks are due to Dr. Marie Stopes for the generous 
help and criticism given to me throughout the writing of this paper, which 
owes its inception to the inspiration produced by her work. She, too, 
supplied some of the material. 
I owe many thanks also to Dr. A. Smith Woodward, of the Geological 
Department, British Museum (Nat. Hist.), and to Mr. W. N. Edwards 
