SELLARDS.|] Fossil Plants, Upper Paleozoic, Kansas. 431 
served specimens from the Le Roy shales; and Mr. David White 
has recently obtained, through F. F. Crevecceur, a series of 
thirty-six specimens from the Elmdale formation at Onaga, 
Kan. Mr. White has very generously put this material into my 
hands for study and illustration in connection with the Uni- 
versity of Kansas material. The fossil consists of a large 
orbicular leaf-like expansion, goblet-shaped, with entire bor- 
ders and thickened central base or point of attachment, from 
which radiate three or four to six or seven ribs, strong and 
elevated at the base, flattened and disappearing toward the 
margin; from either side of these primary ribs are given off 
smaller ribs or veins which, diverging slightly, continue to 
the border. The number of primary ribs is not constant. When 
five are present there is, in some specimens at least, a tendency 
to unsymmetrical development, resulting in unequal angles be- 
tween the ribs. Two of the five ribs lie almost in a straight 
line across the organ, one divides the angle in front of these 
two, while two are contained in the space behind, making 
angles in front of the cross lines of almost 90 degrees, while on 
the other side there are three angles of scarcely more than 60 
degrees. When six ribs are present, however, the space is 
equally divided between them, and the six ribs lie in three pairs 
across the organ. Likewise, when only four ribs are developed 
they are regularly arranged, making the form of a cross on the 
base. Two small and incomplete specimens from Onaga seem 
to have only three primary ribs, which are arranged in a 
triradiate manner. The lateral veins go off from the primary 
ribs very obliquely, run nearly straight, curving out but little, 
almost parallel, or diverging slightly, to the border. The main 
ribs gradually disappear toward the border, terminated by a 
dichotomous division. 
One of the fossils as preserved in the Le Roy shales retains 
in part its original shape. It is seen directly from the base. 
The point of attachment is well marked. Six main ribs placed 
in apposition run out from the base. These are thick and ele- 
vated at the origin but disappear by dichotomy before reach- 
ing the border. The lateral veins are 2 to 5 mm. apart, nearly | 
parallel, curving and diverging a little, especially those near the 
end of the main rib. The border of the specimen is well pre- 
served throughout a part of the distance and is entire, although 
- undulating somewhat. The organ is seen directly from the 
base and presents a symmetrical development, in which respect 
