DESCRIPTIONS OF SPECIES. 35 



described by Lesquereux under the name of J. Schimperi, but his descrip- 

 tion and figures indicate a plant different from this one. He describes the 

 leaves of his species as being broadest near the base, long- and narrow, having 

 a nervation that differs from that of the leaves before us; the lateral nerves 

 being camptodrome — that is, uniting in festoons along the borders and the 

 tertiary nervation forming rectangular areoles — while in our species a large 

 part of the lateral nerves terminate in the margins and the tertiary nervation 

 is more open and irregular. 



Formation and locality : Tertiary (Green River group). Green River, 

 Wyoming. 



Carya antiquorum Newb. 



PI. XXXI, figs. 1-4. 



Ann. X. Y. Lye. Nat. Hist., Vol. IX (April, 1868), p. 72; Ills. Cret. and Tert. PI. 

 (1878), PI. XXIII, figs. 1-4. 



"Leaves pinnate, large, leaflets lanceolate, long-pointed, acute, sessile, 

 finely serrate, middle leaflet broadly lanceolate, widest above the middle, 

 narrowed to the base, which is somewhat unequal; lateral leaflets narrow, 

 lanceolate, unsymmetrical throughout, somewhat falcate; nervation sharply 

 defined, conspicuously parallel, medial nerve straight in the terminal leaf- 

 lets, more or less curved in the lateral ones; secondary nerves springing 

 from the midrib at a large angle, numerous, subparallel, all arched upward, 

 then- extremities prolonged parallel with the margins of the leaf; the upper 

 ones strongly arched, but terminating more directly in the margins; tertiary 

 nerves distinct, mostly simple, straight, and parallel among themselves, con- 

 necting adjacent secondary nerves nearly at right angles." 



The form, serration, and nervation of these leaves are entirely those of 

 Carya, and while without the fruit it may not be possible to fix their place 

 in the series more definitely than to say that they represent the genus 

 Juglans as formerly constituted, including Carya, we may at least refer 

 them with confidence to a place within the limits of that genus. The 

 leaves of the species of Carya and Juglans are very similar, so much so 

 that some of the Caryas, such as C. olivceformis, have leaves that could in 

 the fossil state hardly be distinguished from those of Juglans. 



The specimens before us, however, seem to me to be more widely 



