4A0 Umversity Geological Survey of Kansas. 
Odontopteris; but the frond as a whole is very different from 
that genus. There is a resemblance perhaps worth noting be- 
tween Glenopteris and the smaller species of Megalopteris 
Dawson in the sessile decurrent pinnules, but the rigid fronds 
of Glenopteris, with strong axial development, are very dif- 
ferent from the fronds of Megalopteris, which are large, and 
often bifurcate at the top. 
Glenopteris has, in the shape and development of the frond, 
a very striking resemblance to the Mesozoic genera Loma- 
topteris Sch. and Cycadopteris Zigno. The resemblance of the 
large species of Glenopteris to Lomatopteris is especially close. 
The form and method of development of the frond in the two 
genera are very similar. Both have a strong, roughly striated 
rachis, and pinnules reduced at the base of the petiolate frond. 
Lomatopteris is described by Schimper as having its venation 
entirely obscured; the venation of Glenopteris is always indis- 
tinct, and in G. lobata entirely concealed. The auricled base, 
which distinguishes most of the species of Glenopteris from 
Lomatopteris, is wanting in G. lobata. This latter species fur- 
ther resembles Lomatopteris by a very similar lobation of the 
borders. The essential character separating this species from 
that genus is the absence of the thickened border. 
White?** has already suggested the possible relation of the 
Alethopterideze with the Triassic genera Lomatopteris and 
Cycadopteris. The genus Glenopteris from the Permian hav- 
ing an evident relation to both Protoblechnum from the Coal 
Measures, and to Lomatopteris and Cycadopteris from the 
Trias, makes such a relation much more probable. As far as 
it is possible to conclude from the evidence of sterile fronds, 
these three genera seem to have a direct genetic relation. 
Glenopteris splendens Sellards. 
Kansas University Quarterly, vol. 9, pp. 182-184, pl. 87, fig. 1; 
pl. 40, 1900. 
Fronds large, deeply pinnatifid, slightly curved or straight, 
coarse, spreading, broadly elliptical, 45 or more cm. long, with 
a spread of about 20 cm., thick in life, leaving a dark carbona- 
ceous layer on the rock, petiolate, broadest in the middle, ta- 
pering to base and apex. Rachis strong, rigid, continuing well 
towards the apex of the frond, roughly marked with longitudi- 
nal striz; in the fossil condition flat, or the original more or 
294. Bull. Geol. Soe. Am., vol. IV, 1893, p. 119. 
