FROM THE TERTIARY OF THE STATE OF MISSISSIPPI. 



415 



broader leaves of the same species. The three forms here considered have as common 

 characters the peculiar great length of the leaves, the entire margins, the broad medial 

 nerve, and thick petiole. 



8. Quercu s Moorit, Spec. nov. PI. xvi, Fig. 1, 2, 3. Q. foliis coriaceis, oblanceolatis, vol obovatis oblongis, 

 elongatis, sububtusis, margins remote, breviter serratis ; nervis seeundariis, sub angulo latiore egredientibus, curva- 



tis, craspcdodromis. 



lied shale. 



The peculiar nervation of this beautiful species of oak shows the identity of the three 

 specimens here figured. The secondary nerves, emerging from the medial one in an open 

 angle (50 to 65°), curve upwards, and preserving about the same thickness in their whole 

 length, abruptly bend backwards near the margin in entering the teeth. These secondary 

 nerves are mainly opposite near the base, but become alternate and more distant in the 

 upper part of the leaves. Judging from this appearance, and also from the scarcely de- 

 creased thickness of the medial nerve, the preserved part of the large leaf, Fig. 1, is not 

 more than one-half of its whole length. Another specimen of the same species, which 

 lias not been figured, on account of obliteration of its borders, measures, from the top to 

 near the base of the petiole, six inches, and is two and one-half inches broad. In the 

 same proportion, the large leaf, which is four and one-half inches broad, would be nearly 

 one foot long. These dimensions, compared with those of some oak leaves of our time, 

 with the leaves of Quercus macrocarpa, Mich., for instance, are not extraordinary. This 

 oak is related also to our fossil species by its nervation and the general outline of its 

 oblanceolate leaves. 



I do not know any other living species to which this fossil oak might be compared, 

 except, perhaps, to Quercus densijlora, Hook, from California. It is named for Rev. W. 

 1). Moore, a voluntary and most valuable coadjutor of Prof. Hilgard in his survey. 



9. Quercus LYELLII, Hccr. PL xvii, Pigs. 1, 2, 8. Q. foliis subcoriaceis, laneeolatis, acutis vol brevi acu- 

 miuatis, basi in petiolo brcvi attenuatis, margine integris, undulatis, nervo medio recto, nervis seeundariis apertis, 

 curvatis, ramulo superiore margine approximate. 



lied shale. 



No difference is perceivable between the figures given by Prof. Hcer of this species, in 

 his Fossil Flora of Bovey Tracey, PI. lxiii, Fig. 2 to 9, and ours. The general outline of 

 the leaves, their margins entire or wavy, the direction and branching of the secondary 

 nerves, the reticulation also, all is similar. In the three broken specimens here figured, 

 the three essential forms indicated by the author of this species are even recognized : 

 Narrow lanceolate leaves tapering toward the base, with slightly undulate borders as in 

 Fig. 1 ; longer, proportionately narrower leaves, with nearly parallel sides, as in Fig. 3 ; 



