95 



imens. It will be remarked, however, that the first lateral vein of the left 

 side has no divisions whatever, while that of the other side has three strong 

 branches. The absence of the medial secondary veins may, therefore, be 

 casual, or the veins may have been erased from the impression of the leaves. 

 As it is seen from the divisions of the primary nerves, and of their branches, 

 in PI. xxvi, Fig. 3, the direction of the nerves and their ramifications are very 

 irregular. 



Habitat. — Bluffs of Salina River, eight miles above its mouth. 



Menispermites obtusiloba var. (?), PI. xxii, Fig. 1. 



Dombeyopsis obtusiloba, Lesqx., American Journal of Science and Arts, loc. 



cit., p. 100. 



The specific relation of this fine leaf with those described for the former 

 species is not positive. The general outline of the leaf is the same, as, also, 

 the five-palmate nervation, with two lower marginal veins. The first pair of 

 nerves, however, is turned upward on a more acute angle of divergence, and 

 the leaf does not appear peltate. In comparing, however, the primary nerva- 

 tion with that of. the small leaf of PL xxv, Fig. 2j it will be seen that in this 

 last specimen the inner lateral pair of nerves has in both the same direction, 

 and that, too, at the base of each leaf, which in both is destroyed by erosion, 

 there is a small marginal border, which looks as if originally joined under the 

 point of union of the nerves. Except these differences, the relation is evident 

 by the form, three obtusely-lobed, of the leaf, its round truncate base, the 

 direction of the nervilles, the thick substance, &c. 



Habitat. — The same place as the normal form. This splendid specimen 

 is in the cabinet of the Smithsonian Institution, presented by Prof. B. F. 

 Mudge. 



Menispermites salinensis, Lesqx., PI. xx, Figs. 1, 4. 



Leaves tbickish, membranaceous or subcoriaceous, triangular in outline, obtusely palmately five- 

 lobed, or deeply undulately lobed, palmately five-nerved from tbe enlarged truncate base. 



Acer obtusilobum(l), Ung., Lesqx., American Journal of Science and Arts, 



Loc. cit., p. 100. 

 Populites salince, Lesqx., Hayden's Report, 1872, p. 423. 



The study of these leaves, made on the place where I found a large 

 number of more or less fragmentary specimens, near Salina, afforded means 

 of comparison between their forms and nervation; and, from the intermediate 

 and transitional characters, I had to admit them as representing a single 



