294 OLDER MESOZOIC FLORAS OF UNITED STATES. 
CreNOPHYLLUM ROoBUSTUM (Emmons) Fontaine. 
Pl. XXXIX, Fig. 10. 
1857. Plerophyllum robustum Emm.: American Geology, Pt. VI, p. 122, fig. 91 on p, 
123. 
1857. Pterophyllum robustum var.? Emm.: Op. cit., p. 128, fig. 92. 
1857. Pterozamites obtusus Emm.: Op. cit., p. 119, fig. 86a. 
1883. Clenophyllum robustum (Emm.) Font.: Older Mesozoic Flora of Virginia, Mon. 
U.S. Geol. Survey, Vol. VI, p. 116, pl. liv, figs. 6, 7. 
1883. Ctenophyllum Emmonsi Font.: Op. cit., p. 118, pl. liv, fig. 1. 
Emmons gives, in American Geology, Pt. VI, pp. 122, 123, figs. 91, 92, 
a description of a cycad which he calis Pterophyllum robustum. I did 
not find in his collection any form corresponding to his fig. 92, which 
represents the terminal portion of a leaf. Only one imprint with its 
reverse was seen. This is evidently the original of Emmons’s fig. 91. 
This figure represents the ends of the leaflets as entire, whereas the 
specimen shows, on careful inspection, that the original tips are want- 
ing. The plant may be a Pterophyllum, but the oblique position of 
the leaflets seems to be the natural one. It is more likely to bea 
Ctenophyllum. 
I did not see the original of Emmons’s fig. 86a, given to represent 
what he calls Pterozamites obtusus. The plant represented by it does 
not seem to be different from Ctenophyllum robustum. Pl. XX XIX, 
Fig. 10, gives a representation of some of the leaflets of C. robustwm, to 
show how the ends of the fragments of leaflets were left in such shape 
that casual inspection might determine them to be true tips. Emmons’s 
fig. 91 gives correctly the dimensions of the leaflets, their closely 
crowded, oblique position, and the number (8 or 9) of the strong nerves. 
But the leaflets narrow slightly toward their tips and are somewhat 
decurrent. 
Genus PODOZAMITES Friedrich Braun. 
PopozAMITES LONGIFOLIUS Emmons. 
Pl. XL; Pl. XLI. 
1856. Cycadites longifolius Emm.: Geological Report of the Midland Counties of North 
Carolina, p. 330. 
1856. Podozamites longifolius Emm.: Op. cit., p. 331. 
1857. Cycadites longifolius Emm.: American Geology, Pt. VI, p. 115, fig. 82. 
1857. Podozamites longifolius Emm.: Op. cit., p. 116, fig. 83. 
1883. Dioonites longifoltus (Emm.) Font.: Older Mesozoic Flora of Virginia, Mon. 
U.S. Geol. Survey, Vol. VI, pp. 111, 122, pl. liii, fig. 5. 
1883. Podozamites Emmonsi Font. non Newb.: Op. cit., p. 77, pl. xxxiii, fig. 2. 
Emmons gives, in American Geology, Pt. VI, p. 116, fig. 83, a repre- 
sentation of a fine cycad which he calls Podozamites longifolius. The 
figure unfortunately represents a distorted specimen, and hence the true 
facies of the plant is not given. I found among Emmons’s specimens 
