FONTAINE, ] THE EMMONS COLLECTION. 301 
Genus ZAMIOSTROBUS Endlicher. 
ZAMIOSTROBUS VIRGINIENSIS Fontaine. 
Pl. XLII, Fig. 2. 
1857. Lepidodendron sp. Emm.: American Geology, Pt. VI, p. 124, figs. 93, 94 on p. 
125. 
1883. Zamiostrobus virginiensis Font.: Older Mesozoic Flora of Virginia, Mon. U. 8. 
Geol. Survey, Vol. VI, p. 85, pl. xlvii, figs. 4, 4a, 5, 5a. 
1883. Zaniostrobus sp. Font.: Op. cit., p. 117, pl. liv, fig. 10. 
In the collection of Emmons there is an imprint of a cycadaceous 
form that seems to be identical with fossils found in the Older Mesozoic 
of Virginia and named by me Zamdostrobus virginiensis. The speci- 
men has Emmons’s field label, marked Lepidodendron. From this he 
probably regarded this plant as of the same general nature as those 
fossils which he mentions on pages 124 and 125 of his work, as having 
the external marks similar to those of Lepidodendron. He gives fig- 
ures of two of these (figs. 93, 94) and speaks of them as branching. If 
they branch they are probably some conifer. The fragment seen by 
me isa portion of an imprint of a stem or cone. Not enough is shown 
to enable one certainly to make out the size and shape of the original. 
It seems to have been of small size. Its original shape seems to have 
been oblong with at least one end truncately rounded off. To the 
unaided eye the scars, which are of small size, appear as crescent-shaped 
depressions, transverse to the axis of the cone. Examined closely 
with the help of a lens, they are seen to be leaf scars of the same char- 
acter as those shown by Cycadeoidea Emmonsi, but decidedly smaller. 
They have their present form from having been distorted by pressure, 
which has caused a creeping of the rock matter in the direction of the 
axis of the fossil, so as nearly to close up the scars in that direction. 
It is quite possible that this is an imprint of acycad trunk of the same 
kind as Oycadeoidea Emmonsi. If so, this specimen must have been a 
still smaller trunk. It is noteworthy that both this fossil and the 
Cycadeoidea are simply impressions, apparently made by the surface 
of the organism. Most cycad trunks are petrifactions. 
