350 OLDER MESOZOIC FLORAS OF UNITED STATES. 
probably surpassed the greatest dimensions seen. The nerves are 
about three-fourths of a millimeter apart. They are slender butsharply 
defined. They go off nearly at right angles with the midrib and then 
arch slightly forward toward the end of the frond. They are parallel 
in their course and are nearly all unbranched. Very few branch and 
nearly all that fork do so before reaching the middle of the lamina of 
the frond. 
Several specimens of this plant were found at the locality ‘‘ In the 
bed of a ravine that leads from the Banner mine,” etc., but all were 
quite fragmentary and poorly preserved. The varying size of the 
fronds is no doubt due to the varying age of the same. 
This fossil, although probably a new species, seems to be quite near 
to Teniopteris lata Oldh. and Morr.,' of India, but the midrib is wider 
and not so rigid as that of the plant from the Rajmahal flora. 
Pl. LIV, Fig. 1, gives the basal portion of a small form, and Pl. 
LIU, Fig. 1, a fragment of one of the largest leaves. 
MaAcrROTANIOPTERIS NERVOSA Fontaine. 
Pl. LIV, Fig. 3; Pl. LV, Fig. 1. 
1896. Macroteniopteris nervosa Font.: Am. Jour. Sci., 4th Ser., Vol. II, p. 274. 
Leaf very large, dimensions not made out. Midrib very large. 
The largest imprint of it seen had a width of 15mm. Not enough of 
the frond was seen to show the entire course of the lateral nerves. 
As seen, they go off from the midrib at a large angle, then arch 
‘slightly away from it and are parallel for all their course seen. They 
sometimes have a common point of insertion for two adjacent lateral 
nerves, which are then single. Sometimes each nerve has an inde- 
pendent point of insertion, and then these may fork near the midrib. 
The lateral nerves are very thick and cord-like and very remote. 
No known Macroteniopteris has nerves anything like those of this 
plant. The fragments found were evidently but small portions of the 
original fronds. They indicate for it a gigantic size. 
Two fragments were found, one at the locality ‘‘Bank of Feather 
River,” etc., and one at the locality ‘‘In the bed of a ravine that 
leads from the Banner mine,” etc., that must have belonged to gigan- 
tic fronds. Pl. LIV, Fig. 3, and Pl. LV, Fig. 1, give the two most 
perfect specimens, which have a midrib 8 mm. wide. 
1 Fossil Flora of the Rajmahal Series, pl. ii, fig. 1. 
