229 SYSTEMATIC PALEONTOLOGY 
Cass ANGIOSPERMAE. 
Subclass MONOCOTYLEDONAE. 
MonocoTYLEDON gen. et sp. ? 
Plate LXX, Figs. 8-11. 
Description.—These fragments are evidently portions of some mono- 
cotyledonous plant. Figs. 9 and 11 apparently represent the upper or 
outer part of the leaf blade, Figs. 10 and 12 the base. The nerves are fine, , 
distinct, and separate below or at the middle of the leaf (Fig. 11) curv- 
ing and running together above or near the margin (Fig. 9) Some at 
the basal portion of the leaf have the appearance of being forked (Figs. 
10, 12), but this may be due to lateral compression. In dried herbarium 
specimens, parallel-veined leaves often present this appearance and the 
upper portion of Fig. 10 strongly suggests such a condition. Somewhat 
similar remains are figured by Heer, from the Miocene of Spitzbergen, 
under the name of Alisma macrophyllum (Fl. Foss. Arct., vol. iv, pt 
1, p. 66, pl. xxvi, xxvii) ; from Eriz, Switzerland, as Aronites dubius (Fl. 
Tert. Helvet. vol. i, p- 98, pl. xlvi, fig. 5) ; and from the Baltic provinces 
as Zingiberites undulatus (Mioc. Balt. Fl., p. 64, pl. xvii, figs. 1-3). 
Comparison may also be made with Musophyllum complicatum Lesq- 
(Tert. Fl., p. 96, pl. xv) but the Maryland specimens are too fragmentary 
for even generic determination. 
Occurrence.—SunDERLAND Formation. Near the headwaters of Is- 
land Creek, Calvert County. 
Collections.—Maryland Geological Survey. 
Subclass DICOTYLEDONAE. 
Order JUGLAN DALES. 
Family JUGLANDACEAE. 
Genus JUGLANS Linne. 
JUGLANS ACUMINATA Al. Br. ? 
Plate LXXII, Fig. 15. 
Juglans acuminata Al. Br., 1845, Neues Jahrb., p. 170. 
Description —This a is probably referable to the above species 
as — be seen de comparison with those figured by Heer (Fl. Tert- 
