230 SYSTEMATIC PALEONTOLOGY 



Alask, pi. v, fig. 2; ibid., vol. ii, Foss. Fl. 1ST. Greenl. pi. xlv, figs. 5a, c 

 and xlvi, figs. 6, 7a; ibid., vol. y, Foss. Fl. Sibiriens pi. xv, fig. 19; ibid., 

 vol. v, Mioe. Fl. Sachalin, pi. ix, fig. 10 and x, figs. 1, 2; ibid., vol. vii, 

 pis. lxxv, fig. 11, lxxxix, fig. 9, xcii, fig. 9, xcv, figs. 6, 7 and xcvii, fig. 

 3; Lesq. Tert. FL, pi. xxvii, fig. 7, etc.) Figure 14 might also be com- 

 pared with Ulmus minuta G-cepp. (Zeitsch. Deutsch. G-eol. Gesellsch., vol. 

 iv, p. 492; Tert. Fl. Schossnitz, p. 31, pi. xiv, figs. 12-14), but it would 

 seem to be the wiser course not to separate this mere fragment from the 

 other with which it is associated. 



Occurrence. — Sundeeland Formation. Near the headwaters of Is- 

 land Creek, Calvert County. 



Collections. — Maryland Geological Survey. 



Genus CELTIS Linne. 



Celtis pseudo-crassifolia n. sp. 

 Plate LXXI, Fig. 9. 



Description. — Leaf about 1^ inch long by | 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 approxi- 

 mately at right angles between the secondaries and between the second- 

 aries! and the midrib, curving upward from the outside of the basal second- 

 aries, where they connect close to the margin, with fine sub-divisions ex- 

 tending 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 sev- 

 eral 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. 



