768 Jeffrey.—On the Affinities of the Genus Yezonia. 
of New Jersey and New York (Memoirs of the New York Botanical Garden, 
vol. iii, Studies of Cretaceous Coniferous Remains from Kreischerville, New 
York, PI. 4, Figs. 12-14). It is obvious from these figures and similar ones 
published by other authors that in the case of Brachyphyllum we have to 
do with leafy twigs characterized by spiral phyllotaxy of fleshy leaves 
appressed to the surface of the stem and originating with a broad base. 
The leaves were free from the surface of the stem only along their extreme 
margins and were characterized by superficial striations converging towards 
the apex, marking lines of sclerified hypodermal tissue. 
General Internal Structure. 
Fig. 1, PL LXV, shows a transverse section of a young specimen of 
Brachyphyllum macrocarpum from the Kreischerville deposit. Indications 
of the presence of five leaves may be seen on the surface of the stem, two 
of which are much broader because cut through their bases in the plane of 
section and are on the left of the figure. Three remaining leaves, cut 
nearer the apex, appear on the right. The central cylinder can scarcely be 
seen with the degree of magnification employed, but is composed of 
separate strands of xylem. Fig. 2, PI. LXV, shows a somewhat tangential 
longitudinal section of a similar specimen. Here again a number of leaves 
occupy the margins of the figure. Several of the fibrovascular strands of 
the central cylinder appear in the middle of the figure. A bundle can be 
seen passing into the second leaf apex on the right of the figure. This is 
the normal mode of fibrovascular supply to the foliar organs of Brachy¬ 
phyllum . Fig. 3, PI. LXV, shows a tangential section through a leaf of 
the genus under discussion to illustrate the branching leaf veins, which 
distinguish this Conifer from the mass of other Mesozoic representatives of 
the order. The branching of the foliar strands is from above downwards, 
the figure being oriented in its natural position. To the left of the figure 
can be seen indications of the presence of stone cells, such as are common 
in both the cortex and pith of Cretaceous Araucarineae. In the outer 
portion of the leaf the numerous fibrovascular strands become merged in 
a broad zone of transfusion tissue. This is well shown in the longitudinal 
radial view presented in Fig. 4, PI. LXV, the light stripe down the middle 
of the figure marking the position of the transfusion tissue. 
The Stomata of the Leaf. 
Fig. 5, PI. LXV, illustrates the appearance of the outer and free surface 
of the leaf. Along the free margin is seen the epidermis thickened by 
a layer of hypoderma, the latter being interrupted opposite depressions in 
the surface of the leaf corresponding to the stomata. Fig. 6, PL LXV, 
represents the leaf surface in the vicinity of a stoma highly magnified. The 
