FOSSIL FLORA. 739 



passing through the middle of the blade; secondaries about 8 pairs, alter- 

 nate, strongly eamptodrome, forming broad loops at a marked distance 

 from the margin, occasionally with a series of smaller loops outside; inter- 

 mediate secondaries occasional; nervilles few, percurrent; finer nervation 

 forming large quadrangular meshes. 



The specimens figured are the only ones observed of this species. The 

 best preserved is a little over 10 cm. in length and 4 cm. broad. It is 

 marked by the long, slender, and falcate apex, and the peculiar looped 

 secondaries, which are joined far inside the margin. One side of the basal 

 portion of the leaflet is missing, but from the direction of the secondaiies 

 it is probable that it was somewhat unequal-sided. 



Fig-. 1, PI. XCVIII, which lacks both base and apex, must have been 

 at least 13 cm. in length, and was probably longer. The other (fig. 2, PI. 

 XCVIII) was about the size of the best-preserved example. 



These leaflets very closely resemble Fraxinus affinis Newby., 1 from 

 Bridge Creek, Oregon. This has the same type of nervation, but is ranch 

 smaller, very slightly unequal-sided, and with more numerous and more 

 regular looped secondaries. The finer nervation is identical in each. 



There is some doubt as to the correctness of the reference of New- 

 berry's leaf to the genus Fraxinus. This much resembles the genus 

 Sapindus and may possibly belong to it. Sapindus grandifoliolus Ward 

 from the Fort Union group, for example, has much resemblance in general 

 character to these leaves. It would seem that they should all be in the 

 same genus. However, the leaflet under consideration is undoubtedly 

 closely allied to what Ward has called Sapindus, and for the present they 

 may remain there. 



I have named this characteristic species in honor of Prof. Lester F. 

 Ward, who was present when it was collected. 



Habitat: Fossil Forest Ridge, bed No. 5; collected hy Lester F. Ward 

 and F. H. Knowlton, August 16-19, 1887. Yellowstone River, one-half 

 mile below mouth of Elk Creek; collected by F. H. Knowlton, August, 

 1888. 



2 



' IT. S. Nat. Mus., Vol. V, 1882, p. 510; Pl:ites (iued), PI. XLIX, fig. 3. 

 '-Types of the Laramie PI., p. 67, PI. XXX, figs. 4, 5. 



