E. B. Andrews—New and interesting Ooal Plants. 465 
have called Orthogoniopteris, from its rectangular nervation. 
The following is a description o : 
Frond simply pinnate. Pinne alternate, lanceolate or oblong, 
linear, rounded or tapering to an acute point, entire or undulate, en- 
rged and decurrent on lower side, rounded on the upper to the 
median nerve, and joining it a little abuve the point of its attachment 
to the rachis, Median nerve prominent, thick and ascending to the 
apex. Nervules forking once very near the median nerve, extending 
at right angles to it, and curving upward slightly at the margin, 
very fine, numerous and uniform. 
Two species have been found, 0. clara and O. Gilberti. This 
genus is allied to Zeniopteris Brongt., to Angiopteridium Sch., 
and to Neriopteris Newb. The nervation is similar to Tteniop- 
teris, but Toeniopteris has a simple frond, while this is pinnate. 
In Angiopteridium the frond is pinnate and the pinne are cor- 
date or rounded, with a marginal fructification. In Dr. New- 
berry’s new genus, Neriopteris, the pinne are similarly cordate 
_ With acute-angled nervation and with a supposed marginal fruc- 
tification. In this new genus the pinne are decurrent below, 
and free and rounded above, with a perfectly rectangular nerva- 
tion. In the decurrent base of the leaflets it is allied to the 
C genus which may he represented by A. Serlit, 
and is doubtless allied to Dr. Newberry’s new species, A. mac- 
rophylla. The essential characters which distinguish it are: 
first, the great length of the frond, which measures at least fifty 
centimeters; second, its lanceolate, or rather oblanceolate 
form, the leaflets decreasing in length toward the base; third, 
the linear taper-pointed form of the leaflets, comparatively long 
and narrow; and fourth, the always simple division of the 
nd. It is possible that we have in these various species of 
lethopteris, and in closely allied forms, a group which should 
be detached and formed into a new genus ‘This group passes, 
in resemblance, into the type of the Tventopteridee on the 
One hand and through the Megalopteris (the M. minima having 
much the look of an Alethopteris) unto the distinct Newropteris 
type on the other. These resemblances are of great interest 
