Species novae Pleistocaeniae Marylandicae. 103 
living U. americana L., and U. racemosa Thomas, and it is quite possible 
that they are identical with one or the other of these species. They may 
be' more or less satisfactorily compared with several fossil forms, such 
as U. affinis Lesq. (Mem. Mus. Comp. Zool, Harvard College, vol. VI, 
no. 2, p. 16, pl. IV, figs. 4, 5) which, however, is described as long 
petioled; U. pseudo-americana Lesq. (Cret. and Tert. F1, p. 249, pl. LIV, 
fig. 10) which differs principally in its larger size and in the strict, 
parallel character of its nervation; U. tenuinervis Lesq. (Ann. Rept. U. S. 
Geol. and Geog. Surv. Terr., 1873 [1874], p. 412; Tert. F1, p. 188, 
pl. XXVI, figs. 1—3) which is more elongated; and also with U, fisheri 
Heer, U. plurinervia Ung. and U. bronnü Ung., all of which species differ 
from each other no more than the leaves of U. racemosa or U. americana 
on a single branch often differ between themselves. The apparent relation- 
ship is indicated in the specific name adopted, instead of referring the 
fossil, without question to the living species. 
Sunderland Formation. Near the headwaters of Island Creek, 
Calvert County. Maryland Geological Survey. 
9. Celtis pseudo-crassifolia Hollick, 1. c., p. 230, pl. LXXI, fig. 9 [fossil]. 
Leaf about 11}, inch long by 3/, inch wide, inequilateral (?) sparingly 
dentate below, entire above and tapering irregularly to the apex; secondary 
nervation camptodrome, consisting of a pair springing from the base and 
three or more above, which bend abruptly near the midrib and extend 
upward almost parallel with it; tertiary nervation approximately at right 
angles between the secondaries and between the secondaries and the 
midrib, curving upward from the outside of the basal secondaries, where 
they connect close to the margin, with fine sub-divisions extending to 
the dentitions. 
It is unfortunate that only this fragmentary specimen was obtained 
upon which to base a description. It is apparently closely related to 
several living species, such as C. crassifolia Lam., C. mississippiensis Bosc., 
C. georgiana Small, and C. occidentalis L., in all of which the leaves may 
vary considerably in size, shape, and degree of dentition and with any 
one of which it could be compared more satisfactorily than with any de- 
scribed fossil species. This apparent relationship is therefore indicated 
in the specific name adopted. 
Sunderland Formation. Near the headwaters of Island Creek, 
Calvert County. Maryland Geological Survey. 
10. Sapindus marylandicus Hollick, 1. c.. p. 234, pl. LXXII, fig. 11—14 
[fossil]. 
Leaves inequilateral, curved, entire, very unequal below and tapering 
to the base at each side; greatest convexity on the broader side at about 
Ns the distance from the base and on the narrower side at about the 
same distance from the apex; secondary nervation irregularly disposed at 
varying angles of divergence from the midrib, curving and anastomosing 
near the margin or irregularly connected by oblique or curved tertiaries. 
This species is somewhat suggestive of S. oregonianus Knowlton (Bull. 
