LESQUEEEux.! PALEONTOLOGY LIGNITIC FLORA SPECIES. 417 



the leaves, however, are smaller and generally unequilateral, either nar- 

 rowed to the short thick petiole or rounded to it, at least on one side, 

 like the leaflets of a compound leaf. 

 Rabitat. — Middle Park, Dr. Hayden. 



Ehus Hatdenh, sp. nov. 



Leaf pinnately divided in alternate linear or lanceolate, acute, entire 

 leaflets, from a broadly alate lachis, to which they are joined in decnrriug; 

 terminalleafletof the same size and form; nervation pinuate,camptodrome. 

 This fragment of a compound leaf represents a fine and remarkable spe- 

 cies. It is about 5 centimeters long, with a broadly-winged rachis 3 

 millimeters wide on each side of the thin, middle nerve, with three pairs 

 of alternate leaflets 4 to 6 millimeters broad, 2 J centimeters long, lance- 

 olate, obtusely-pointed, nearly at right angle to the main rachis, which 

 they join by an acute sinus in the upper side and a decurring base on 

 the lower one. The camptodrome nervation is similar to that of B, 

 copallina^ L. ; the alar tisa-ue of the rachis is also marked by forking par- 

 allel veinlets, as in the same species. 



Habitat. — Middle Park, Dr. Hayden. 



Pteeocarya AmericA-NA, sp. nov. 



Fragment of ah oblong-lanceolate leaflet, slightly scythe-shaped, with 

 crenulate border, and camptodrome nervation. The outline of the leaflet, 

 though the lower and upper parts are destroyed, is, like the nervation, 

 well defined. Itis comparable to the leaves published by Gaudin, in Cont. 

 (I, p. 40 ,P1. ix. Fig. 2,) under the name of P. Massalongi. The substance 

 of the leaflet is thin, the secondary veins more or less distant, curving in 

 ascending to the borders, and following them in successive bows, anas- 

 tomosing with branches of intermediate shorter veins; nervilles distinct, 

 nearly at a right angle to the secondary veins. Except that the borders 

 of this leaflet are not as deeply serrulate, and that the secondary veins 

 curve nearer to the borders, there is not any noticeable difterence between 

 the American and the Italian form. 



Habitat. — Middle Park, Dr. Hayden. 



PoDOGONiUM, species. 



The collection has, representing this genus, a capsule, with its pedicel. 

 It is, however, broken in the middle, and its specific relation undiscern- 

 ible. There is also, from another locality, a fragment of a Ungulate 

 leaflet, with a close, thin camptodrome nervation, comparable to the 

 leaves of P. Knorrii, Heer. 



Habitat. — Middle Park: the leaflet, Dr. Hayden } the fruit, Flori- 

 sant, South Park, Dr. Peale. 



CJESALPINIAC?) LINEARIS, Sp. nOV. 



A branch of a compound leaf, with a narrow filiform rachis, bearing 

 sevenpairsof small, opposite, linear leaflets, sessile, rounded to the point 

 of attachment, sliarp-pointed, concave or scythe-shaped at the upper 

 side, thickivsh, without trace of nervation of any kind. I know nothing 

 to which this fragment could be compared. It resembles a branch of 

 distichous conifer ; but the mode of attachment of the leaflets, rounded 

 to the base, all opposite ; their scythe-shaped form, &c., are at 

 variance with the characters of conifers. It is distantly related to 

 species of Cwsalpinia, like Cadia varia. Hear, or some Acacia, like A. 

 27 GS 



