882 SYSTEMATIC PALEONTOLOGY 



While it may be considered probable that from a biologic viewpoint the 

 forms mentioned in the foregoing paragraphs, as well as others not cited, 

 represent the variations of a single species of Upper Cretaceous tree, or 

 at least represent the leaves of closely filiated species, it seems best from 

 the viewpoint of systematic, and especially stratigraphic, paleobotany, 

 that most of the differentiations instituted by Lesquereux be perpetuated. 

 Consequently the present series is limited to the typical material as defined 

 and illustrated by the original describer. 



Falling within these limits are a number of unrecorded occurrences 

 from the Raritan formation of Maryland. 



Occurrence. EAEITAN FORMATION. Bull Mountain and Shannon 

 Hill, Cecil County ; Brightseat, Prince George's County ; Glymont, Charles 

 County, Maryland; East Washington Heights, Overlook Inn Road, Dis- 

 trict of Columbia. 



Collections. Maryland Geological Survey, U. S. National Museum. 



AEALIOPSOTDES CRETACEA DENTATA (Lesquereux) Berry 

 Plate LXXXVII, Fig. 1 



Sassafras (Araliopsis) cretaceum dentatum Lesquereux, 1846, Ann. Kept. U. 



S. Geol. and Grogr. Survey Terr, for 1874, p. 344. 

 Sassafras (Araliopsis) cretaceum Lesquereux, 1874, Cret. Fl., p. 80 (pars), 



pi. xi, figs. 1, 2. 

 Araliopsis cretacea dentata Berry, 1911, Bull. Torrey Bot. Club, vol. xxxviii, 



p. 416. 



Description. Leaves of small or medium size, trilobate in general out- 

 line, with cuneate or decurrent base, and acuminate tips. Length ranging 

 from 6 cm. to 11 cm. Maximum width, at a point about midway between 

 the apex and the base, ranging from 5 cm. to 10.5 cm. Sinuses separating 

 the broad and rapidly narrowed lobes, open and rounded, not reaching 

 half-way to the base. Margins entire below, more or less dentate above. 

 Teeth not prominent, widely and irregularly spaced, separated by very 

 shallow sinuses. Petiole stout, enlarged at the base, about 3 cm. in length. 

 Midrib stout and prominent. Lateral primaries, one on each side running 

 to the tips of the lateral lobes, stout, prominent, diverging from the midrib 

 at acute angles (45 or less) above its base, slightly curved outward 



