FOSSIL PLANTS 153 



whence they are rather abruptly rounded to the obtuse apex ; margin 

 obscurely but relatively finely serrate except in the basal portion ; mid- 

 rib very thick, straight ; secondaries numerous, about 18 pairs, very 

 strong, alternate, at somewhat irregular distances, arising at an angle 

 of about 45, slightly curving upward, usually with several craspedo- 

 drome branches near the margin, campto-craspedodrome ; the secon- 

 daries usually arching just at the margin and joining the one next above 

 with small nervilles, numerous, very prominent and deeply marked, 

 mainly once broken though often percurrent and at right angles to the 

 secondaries. Lateral leaflets of various sizes but in general much 

 smaller than the terminal, elliptical-oblong in outline, abruptly rounded 

 and very unequal-sided at base, moderately acuminate at apex ; margin 

 and nervation practically the same as in the terminal leaflets. 



This fine species is represented by a dozen or more examples, 

 several of which are nearly perfect. The terminal leaflets are from 13 

 to about 23 cm. long and from 7 to 12 cm. wide, while the lateral 

 leaflets are from about 8 to probably 15 cm. long and from 3.5 to 8.5 

 cm. wide. These leaflets are mainly detached, but occasionally two or 

 more are found closely associated and overlapping, and in one instance 

 matted together in such a way as to suggest the probability of former 

 union. There are also preserved in association with them objects that 

 look very much like the rachis of a large compound leaf, but there is no 

 actual evidence to show that these leaflets were ever borne on them. 



This species would seem to find its nearest relative in Hicoria 

 (Carya) antiquora (Newb.) Kn. 1 That species also has large, cori- 

 aceous leaflets, but they differ in shape and in the configuration of the 

 margin, being regularly finely serrate. The nervation is of much the 

 same type. 



Family BETULACEJB 



Betula (branch). 



Pl. XXIV, fig. 2. 



The collection contains a single fragment of a branch showing the 

 lenticels characteristic of this genus. The branch was about i cm. in 

 diameter. 



Corylus macquarrii (Forbes) Heer. . 



Corylus macquarrii (FORBES) HEER, Urwelt d. Schweiz, p. 321, 1865. 



The collection contains a large number of leaves that belong to this 

 well-marked species. 



1 Cf. Lesquereux, Tert. Fl., p. 289, pi. LVII, figs. 1-5, 1878; Newberry, Later 

 Extinct Floras, p. 35, pi. xxxi, figs. 1-4, 1898. 



