(70) 



thetic type of uncertain botanical affinities, with mostly cori- 

 aceous leaves, it has not been considered available. The 

 only Raritan leaf with which our specimen may be com- 

 pared is Tiliaephyllum duhium* which it resembles in its 

 cordate outline, delicate venation, and thin texture ; like the 

 Raritan leaf ours is represented by but a single specimen 

 rather poorly preserved. It differs in being larger and in 

 lacking the dentate margin, and was apparently equilateral 

 with a straight midrib. In view of the uncertainty of New- 

 berry's determination it is desirable that we should endeavor 

 to get an idea of the true botanical affinity of our leaf, which 

 it seems to me will place it among those leaves ancestral to 

 the modern aspens or poplars. It resembles several species 

 of Pofuhis, although the latter are as a rule coriaceous or 

 subcoriaceous, for instance Pofidus Harheriana Lesq. from 

 Staten Island f and the Dakota Group. $ It may be com- 

 pared with Pofuhis balsamoides (}) var. latifolia Lesq.,§ 

 although the latter is a Tertiary species ; the margin is ap- 

 parently similar and the venation is strikingly similar except 

 at the margin. 



It may also be compared with the Dakota species Pofulites 

 Lancastricnsis Lesq. || which it greatly resembles in size and 

 outline ; the secondaries are stouter and straighter in the latter 

 and the basal one is less branched. 



FAGACEAE. 



QuERCus Linn. Sp. PL 994. 1753. 



About two hundred existing species of the northern hemi- 

 sphere, H more than fifty of which occur in North America. 

 The extinct American species number about 127, distributed 



*Newb. Fl. Amboy Clays, 109. /»/. 15./. 13. 

 tHollick, Ann. N. Y. Acad. Sci. 11 : 419. pl- 36./. 8. 

 X Lesq. Fl. Dak. Group, 44. pl. 46./. 4. 

 ? Lesq. Cret. & Tert. Fl. 158. //. 3^-f-4- 

 lILesq. Cret. Fl. 58. />/. J./ /• 



Tl Recorded by Ettingshausen from Tertiary of New Zealand. (Trans. 

 N. Z. Inst. V. 23.) 



