380 GEOLOGICAL SURVEY OF THE TERRITORIES. 



35. Sassafras Mudgii, Lesqx., Northwest Salinas, Kansas, B. F. M. 

 38. Sassafras subintegrifolius, Lesqx., Northwest Salinas, Kansas, 

 B. F. M. 



37. Lyriodendron intermedium, Lesqx., Decatur, Nebraska, F. Y. H. 



38. Lyriodendron giganteum, Lesqx., five miles north of Fort Ellsworth, 

 Kansas, B. F. M. 



39. Magnolia tenuifolia, Lesqx., Decatur, Nebraska, F. V. H. 



40. Dombeyopsis obtusiloba, Lesqx., five miles north of Fort Ellsworth, 

 Kansas, B. F. M. 



41. Acer obtusilobum, (?) Ung., Decatur, Nebraska, F. V. JEL 



42. Acerites menispermifolius, Lesqx., Decatur, Nebraska, F. V. H. 



43. Negundoides acutifolia, Lesqx., Salt Creek, Dakota County, Ne- 

 braska, F. V. H. 



44. Paliurus membranaceus, Lesqx., Decatur, Nebraska, F. Y. LT. 



45. Bhamnus tenax, Lesqx., Decatur, Nebraska, F. V. H. 



46. Phyllites rhoifolius, Lesqx., Lancaster County, Nebraska, F. V. H. 



47. Prunus cretaceus, Lesqx., Decatur, Nebraska, F. V. H. 



48. Phyllites umbonatus, Lesqx., Beatrice, Gage County, Nebraska, 

 F. V. H. 



49. Phyllites amorphus, Lesqx., Decatur, Nebraska, F. V. H. 

 Besides these fifty species, or rather forms of fossil plants which are 



new for the American cretaceous, the specimens sent for examination 

 have numerous representatives of the following species already de- 

 cribed: PlatanusN ewberrii Herr; Laurus (Persea) Nebrasce?isis, ~Le&qx.; 

 Sassafras cretaeeus, Newb'y; Proteoides Daphnogenoides, Heer; Pr. 

 acuta, Heer ; Juglans (Populus) Pebeyana, Heer ; Prunus (Andromeda fj 

 Parlatorii, Heer ; and Phyllites Vannonce, Heer. There is especially a 

 great quantity of specimens of that peculiar Juglans Pebeyana whose 

 leaves, some of them at least, resemble leaves of Populus. The great 

 difference in their size, and in the length of the pedicels ; the mode 

 of curving to one side, or dissymmetry of the small ones, while the largest 

 are exactly symmetrical, mark them as separate leaflets of a compound 

 leaf. For this and their nervation, they are referable to Juglans. Both 

 species of Proteoides are also represented by a large number of speci- 

 mens, all with the former obtained from the same locality. 



Considered in its whole, this group of plants has a strong miocenic 

 fades; though we find in it already two species belonging to genera 

 characterizing the European cretaceous. One is Pterophyllum Haydenii, 

 a plant whose generic name cannot be correct or does not indicate the 

 true botanical relation ; for neither its leaves nor its cone can be re- 

 ferred to Cycadew. But two fragments like ours, of branch with leaves 

 and of a cone, have been described and figured under this generic name 

 by Stiehler, from the cretaceous of Europe, and the affinity of this plant 

 being unknown, I preserved the name on account of geological analogy. 

 The other species is the beautiful Credneria Leconteana, a large leaf, 

 represented by a single specimen, unluckily broken. The essential 

 character of the genus is preserved in a small part of the basilar hori- 

 zontal nerve, as seen in the figure. A few of these new species of our 

 cretaceous do not have any analogy with any others known as yet from 

 the tertiary or the cretaceous or from the flora of our time ; the species, 

 for example, described under the generic name of Populites, which have 

 the secondary nervation straight and continuous to the borders, like 

 leaves of Platanus, the round outlines of leaves of Populus with their 

 base narrowing to a long, slender petiole as in the Beech; the leaves also 

 described as Quercus semi-alatus, which are broadly lobed on one more 

 enlarged side, and entire ovate on the other. Especially of unknown 



