58 



ours it is distinct and evidently of the Liquidambar type. Corda in Reuss. 

 Verstein, PI. li, Fig. 4-5, represents from the Planer Sandstein of Trziblitz 

 equivalent to the lower Quadersandstein of Bohemia, under the name ot 

 Phyllites sp., two fragments of leaves of the same type as ours, or even per- 

 haps of the same species. 



Habitat. — Eight miles above Salina Station, Kansas. The first described 

 specimen, PL ii, Fig. 1, was probably discovered by Professor Mudge at the 

 same locality. It has been communicated by the Smithsonian Institution. 



Populites, Mass., emend. 



Leaves round, oval, obtuse, entire, palniately or subpinnately nerved ; nervation craspedodrome. 



To this genus I refer leaves related by form and nervation to the genus 

 Populus, from which, however, they differ by the generally entire, obtuse 

 leaves, narrowed to the petiole, abruptly curving to it from a truncate or cord- 

 ate base, or passing to it by a longer slightly decurring base ; and especially 

 by the more distinctly craspedodrome nervation ; the lateral nerves and their 

 essential divisions evidently running to the borders. They represent alto- 

 gether some of the characters pertaining to the genera Populus, Fagus, 

 Platanus, and even Acer. Their relation to Populus is so indefinite that 

 Schimper, (Pal. Veget.,) places P. lancastriensis and P. cyclophylla in his 

 doubtful species, while he admits Populates elegans as a true Populus. It is 

 therefore advisable to consider all these forms under a peculiar generic name, 

 until further researches and perhaps the discovery of the fruits may point out 

 their positive relation. Some forms admitted at first into this division are 

 now separated from it on account of a more marked relation with other genera. 

 The name Populites has been already used by Massalongo in Flor. Senig. for 

 the description of a leaf, P. gasparini, which by its form is indeed comparable 

 to some of our Cretaceous species, but whose nervation is different, the lateral 

 veins and their divisions curving along the borders or evidently camptodrome. 



Populites lancastriensis, Lesqx., PI. iii, Fig. 1. 



Leaf largo, broadly cordate, pointed (?) with entiro, slightly undulato borders; primary nerves in 

 five, subpalrnately divided. 



Populus lancastriensis, Lesqx., American Journal Science and Arts, loc. cit., 

 p. 93. 



A large leaf, 12 centimeters broad, 10 centimeters long without the petiole 

 broken 1 centimeter from the base; broadly cordate, apparently pointed, with 



