SAET 4 
OF THE GENERA ZAMITES AND PTEROPHYLLUM. 125 
In some respects it may be regarded as combining characters common to severa] 
Mesozoic Cycad-like fronds, for one can easily see how smaller leaves, such as those 
of Sphenozamites, or of other species of Pterophyllum, or even some Zamitean fronds, 
could be derived from it. On the other hand, if the individual leaflets of the pinnate 
frond are alone considered, they show a very remarkable similarity to the leaves of the 
Paleozoic genera Cordaites and Neggerathiopsis. 
It is, perhaps, hardly necessary to add that it is impossible to correlate either of these 
fronds with those of living genera of Cycads. Wieland has recently pointed out that 
great variations in the size and form of the leaves are found within a single genus of 
these plants. He says “ the pinnules of the Zamias present many gradations, from linear 
forms quite as narrow and long as pine needles to elliptical or somewhat spatulate, 
thick, and fleshy forms like those of Z. furfuracea, which strongly recall the blades of 
certain species of Cordaiteze” *. Further, we know that several species of the Mesozoic 
Zamites have proved to be the foliage, not of Cycads, but of a very distinct race, 
the Bennettiteze. 
BIBLIOGRAPHY. 
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vol. Ixvii. (ser. 5, vol. v.) p. 205, 1894. 
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| p. 129. 
Herr, O. (1865).—Die Urwelt der Schweiz. Zürich, 1865. 
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Nornonsr, À. G. (1890). Beitrüge zur mesozoischen Flora Japans. Denkschr. k. Akad. Wissen. Wien, 
vol. lvii, p. 43, 1890. 
Praes, J. (1871). The Geology of Oxford and the Valley of the Thames. Oxford, 1871. 
* Wieland (1906), p. 191. 
| SECOND SERIES.— BOTANY, VOL. VII. 
