DESCRIPTIONS OF SPECIES. 67 



to be expected that this species, so widespread as it now is, should have 

 some representative in the Tertiary flora. We know that our living flora 

 of North America is the progeny by direct descent of the Tertiary flora, 

 and the result of investigation will undoubtedly be to increase the number 

 of species considered identical in the two floras. 



Formation and locality : Tertiary (Miocene). Bridge Creek, Oregon. 



Alnus sp.? Newb. 



PI. XLVI, fig. 7. 



Note. — Accompanying this figure, on the margin of the plate, and on the 

 specimen label, are memoranda by Dr. Newberry referring it to this genus and 

 giving the locality. Further information in relation to it is lacking. — -A. II. 



Formation and locality: Tertiary (Miocene). Bridge Creek, Oregon. 



Alnites grandifolia Newb. 

 PI. IV, fig. 2. 



Ann. N. Y. Lye, Nat. Hist., Vol. IX (April, 1868), p. 9 (name only); Ills. Cret. and 

 Tert. PL (1878), PL IV, fig. 2. 



Leaf orbicular, with coarsely and obtusely dentate margins ; nervation 

 strong, consisting of a straight midrib with six to seven lateral branches, 

 which are nearly opposite and diverge at less than a right angle with each 

 other. Branchlets spring from these on the outer side; several from the 

 lower pair, two from the second pair, which, like the upper of the two given 

 off from each of the third pair, terminate in the dentations of the border. 

 The tertiary nerves which connect the secondary branches are imperfectly 

 parallel, somewhat closely approximate and continuous, forming a more 

 regular lattice work than is formed in any of the associated leaves except 

 those of Protophyllum. 



No complete specimens of this strongly marked leaf have as yet been 

 obtained, and nothing but an approximation can be made to its botanical 

 affinities. It is, however, so distinctly marked that it deserves notice if for 

 nothing else than that the attention of collectors may be drawn to it. It 

 has been provisionally placed in the ill-defined genus Alnites, because it 

 bears considerable resemblance to some of the leaves of Alnus, but perhaps 

 quite as much to those of Hamamelis. The existence of closely related 



