97 

 Negundoides acutifolia, Lesqx., PL xxi, Fig. 5. 



Leaves divided; leaflets thiu, lanceolate-pointed or enlarged lobate, with acute lobes; veins pinnate, 

 camptodrome. 



Negundoides acutifolia, Lesqx., American Journal of Science and Arts, he. cit., 



p. 101. 



Of this species, described from a mere fragment, I have been unable to 

 see any other specimen but that which is figured. The fragment represents 

 two leaflets, apparently attached to a common, pinnately-divided pedicel ; 

 the lower one deeply bilobate by the forking of the middle nerve, with a 

 broad, dentate sinus, and lobes entire and sharply pointed ; the upper leaflets, 

 (if it is not the lacerated part of the other,) appear simple, lanceolate-pointed, 

 entire; secondary nervation simply pinnate in both fragments of leaves, but 

 compound in the inner part of the lobate leaflet, as it is generally the case for 

 a compound leaf. Professor Unger, in his Chloris, has described, (p. 135, PL 

 xliv, Figs. 3-6,) as Acer pegasinum, two lanceolate-dentate opposite leaflets, 

 upon a common rachis, and which, therefore, appear to belong to a compound 

 leaf like a Negundo. In our N. aceroides, and especially in N. califomicum, 

 the terminal and one of the lateral leaflets become sometimes united into a 

 compound leaf, with some likeness to this fossil fragment. 



Habitat. — Ten miles below Lancaster, Southern Nebraska, Hayden. 



Geeviopsis haydenii, sp. nov., PL iii, Figs. 2, 4 ; PL xxiv, Fig. 3. 



Leaves large, oval, tapering upward to a point, and more abruptly narrowed downward to the base ; 

 borders equally denticulate from below the middle ; nervation abnormally five-palmate, craspedodrome. 



Populites fagifolia, Lesqx., Hayden's Report, 1872, p. 422. 



The description of this species was made out and its name admitted 

 from the examination of the first specimen, (PL iii, Fig. 2,) a small leaf, with 

 borders indistinct, which did not show the details of conformation well 

 enough. The large leaf, obtained since and represented in PL xxiv, 

 Fig. 3, .has its borders and its areolation more distinctly marked. The leaves 

 are of a thick, subcoriaceous texture, 11 centimeters long, without the petiole, 

 from 8 to 11 centimeters broad in the middle, tapering upward, or more or 

 less broadly lanceolate to a point, and narrowed, too, more or less abruptly to 

 the base ; borders equally cut by shallow half-round sinuses, the short teeth 

 all turned outside ; nervation rather pinnate or abnormally five-palmate, as in 

 some species of Populus ; lateral veins at equal distances, ten pairs, oblique, 

 diverging about 45°, nearly straight, the lowest branching, the upper ones 

 simple, all running to the borders, like their divisions ; nervilles in right 

 13 L 



