SELLARDS.| Fossil Plants, Upper Paleozoic, Kansas. 457 
obovate, sides slightly concave, apices rounded, very obtuse, 
entire or dentate, with short regular teeth, distinctly free to 
the comparatively short base, those near the top of the stem 
3 to 5 mm. long, the largest 10 to 15 mm. long, 8 to 10 mm. 
wide. Venation distinct; three to four veins leave the base of 
each leaflet, branch and spread rapidly; the outer ones curve 
decidedly and meet the border a little above the middle of the 
leaflet. Veins numerous, counting 25 to 28 to the leaflet. 
The distinguishing features of this species are the obovate 
form, the lightly notched border which extends well around 
the sides, and the numerous veins 
arising from about three or four 
basal veins, spreading rapidly 
and meeting the border about the 
middle of the leaflet. The species 
is very abundant and has been 
recognized in all the localities in 
the Wellington from which col- 
lections have been made. The 
leaflets, although varying much 
in size on different parts of the 
plant, are constant in shape and 
easily recognized. The plant was evidently tall 
and slender. In some layers the calcareous 
stone is completely filled with this species. 
Some of the stems reach a size of 6 mm. across, 
and continue for a distance of 20 cm. without 
any appreciable reduction in size. The leaflets 
appear to have been deciduous from the older 
part of the stem, as they are found attached 
near the apex only. The branches seem to 
have arisen one only at the node, and are at- 
tached as seen in the accompanying text figure, 
partly below but mostly above the diaphragm 
separating the internodes. S. obovatum differs 
from S. fontaineanum Miller (S. latifoliwm 
Fontaine and White) in the distinct obovate 
form of the leaflets and the more rapid spread- 
ing of the veins, which reach the lateral borders 
ee sooner. S. fontaineanum is described as having 
Sphenophyllum Jeafiets united laterally at the base, the lateral 
obovatum. 
