228 DESCRIPTION OF SPECIES. 



In the first case the basilar lateral nerves are nearly at right angles or 

 somewhat more open than those above ; in the other, as in fig. 2, all the 

 nerves are parallel. 



This species is very closely allied to Ficus uncata, Lesqx., "U. S. Geol. 

 Rep.," vii, pi. xxxv, figs. 1-3, but evidently different by the thin lateral 

 nerves being at a more acute angle of divergence, the close nervilles, and 

 especially the narrower medial nerve and the lower long straight petiole. 



The resemblance of this species is very marked to the Artocarpoides of 

 the "Flora of Sezanne," especially to A. conoceplialoidea, Sap., p. 356, pi. vi, 

 fig. 6, which has the nervation and facies of Brazilian Artocarpece of the 

 genera of Pourouma and Coussapoa. 



Hab. — Bad Lands. Professor Win. Denton. 



Ficus tiliaefolia?, Al. Br. 



"U. S. Geol. Rep.," vii, p. 203, pi. xxxii, figs. 1, 2, 2a, 3; Ixiii, fig. 8. 



The specimen in the collection of Professor McBride is a mere frag- 

 ment, well characterized by its nervation, but too small for positive iden- 

 tification. I mention it merely to show that species of Ficus of the section 

 of the palmately nerved leaves have traversed the whole Tertiary forma- 

 tion, most abundantly distributed in the Eocene, and still represented in 

 the oldest Pliocene of California. This group becomes gradually less pre- 

 dominant like the Palms, in accord with the gradual lowering of tempera- 

 ture in the more recent geological stages. 



LAURINE^]. 



TETRANTHERA, Jack. 



" U. S. Geol. Rep.," vii, p. 217. 



Tetrauthera praecursoria, sp. nov. 



Plate XLVIII, Fig. 2. 



Leaves coriaceous, obloiig (lanceolate 1 ?), gradually narrowed to a short petiole, 

 very entire ; primary nerves opposite from a little above the border base of the leaf, 

 more oblique, the secondary above also opposite, three pairs, parallel, distant, curving 

 in passing to the borders, simple or scarcely branching; nervilles thin at right angles. 



The leaf, whose upper part is destroyed, is 10 to 11 centimeters long 

 and 4 centimeters broad in the middle; the primary lateral nerves are at 



