LE8QUEKEUX.] FOSSIL PLANTS FEOM POINT OF ROCKS. 305 



of Trapa 7iatans, which, though comparable to the fossil ones by the areo- 

 latioii, has its borders deeply toothed and a much thicker consistence. 

 In this species, the leaves appear membranaceous and as pellucid, so 

 distinctly marked in black appear the nervation and the areolation 

 upon the yellowish substance of the leaves. These leaves are mixed with 

 the filaments or rootlets described with Lemnaf bullata, and represent 

 evidently a kind of water -plant. No fossil leaves published as yet are, 

 to my knowledge, comparable to these, except those described by Pro- 

 fessor Newberry, in the Report of the Colorado Exploring Expedition 

 by Lieut. S.O. Ives (p. 131, PI. Ill, fig. 5), under the name of JSfeuropteris 

 angulafa. The outline or general form of the slightly dentate leaves, the 

 pinnate nervation, and the remarkably acute angle of the secondary 

 veins are characters common to both species ; even the irregular though 

 ^00 o bscurely marked division of the secondary veins seems to be of the 

 same kind. It may be remarked that Professor Dawson has observed 

 and described a fruit of Trapa found in connection with his Lenina sou- 

 tata; therefore in circumstances similar to those where these leaves, 

 referred to Trapa^ are found. 



Habitat. — Point of Eocks, Br. F. V. Hayden, Wm. Cleburn. 



23. Laueus (Persea) pe^estens ?, sp. nov. 



Leaf coriaceous, large, broadly lanceolate or elliptical, narrowed up- 

 ward to an acute point, and downward in the same degree to a thick, 

 short petiole; middle nerve thick; secondary veins strong, parallel; 

 nervilles distinct; areolation very small, lightly marked. 



The very fine and well-preserved leaf is sixteen centimeters long from 

 the base of the thick petiole, which is one centimeter long, five centi- 

 meters broad in the middle, where it is the widest, and has thick sec- 

 ondary veins regularly branching, with distinct nervilles and the areo- 

 lation of a Laurus. The foliaceous substance of the lower part of the 

 leaf is destroyed, but the middle thick nerve and the petiole are pre- 

 served, as well as the outline-borders. By its nervation, this species is 

 allied to Persea speciosa, Heer, differing by the form of the leaf and the 

 thick middle nerve. By these two last characters, it is comparable to 

 Laurus princeps, Heer (Fl. Tert. Helv., II, p. 77, PI. XC, tigs. 17-20), 

 differing, however, by the secondary veins somewhatthicker and slight- 

 ly more distant. It- is most closely related to the present Laurus Gati- 

 ariensis, Sm. 



Habitat.— Point of Eocks, Dr. F. V. Hayden. 



2L Viburnum eotundifolium, sp. nov. 



Leaf nearly round, small, surrounded by a black border, slightly and 

 distantly denticulate by extension of the borders at the point of contact 

 of the secondary veins and of their branches, all craspedodrome ; sec- 

 ondary veins open, diverging fifty to sixty degrees, equidistant, parallel, 

 the two lower jjairs ramified, the upper ones only forking near the bor- 

 ders; areolation distinct, from parallel distant fibrillse, branching and 

 anastomosing in large equilateral meshes. 



The black borders of the leaves, the general characters of nervation, 

 and the facies are the same as in the other species of Viburnum pub- 

 lished from Black Butte. This leaf differs especially by its nearly round 

 form, the base rounded to the petiole, the secondary veins more open, 

 and especially the very small, slightly-marked teeth of the borders. But 

 for this last character, this leaf could be referred to Viburnum platanoides, 

 Lsqx., as represented by the small leaf of PI. XXXYIII,.fig..lO, of the 

 20 H 



