390 
PALAEONTOLOGY OF ILLINOIS. 
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Genus ODONTOPTERIS, Brgt. <5 
Ill. Geol. Report, vol. ii, p. 432. 
/ Odontopteris subcuneata, Bunb. 
PI. viii, fig. 10 and 10b. 
From the specimen figured here from Mazon creek, it is‘clear that the fern 
published under this name in the Ill. Geol. Report, vol. ii, p. 433, pi. xxxvi, 
fig. 3, does not belong to this species. It is referable to Odontopteris hetero- 
pliylla , Lesqx., loc. cet„ p. 433, pi. xxxviii, fig. 2 to 5. The pinnules of Odon¬ 
topteris subcuneata , Bunb., are opposite, proportionally longer and narrower, 
slightly narrowed in the middle, and enlarged to the very obtuse point. The 
veins ai’e closer to each other ; and as the English author has figured them, 
they curve downward before coming into the border of the racliis, and descend 
in fascicules along the somewhat decurrent base of the leaflets. In their lower 
part and just above the decurrent border, these leaflets are all strongly bowed. 
The terminal pinnule is broken above the middle ; it is proportionally large, 
and appears to be oval-obtuse, entire or without any lateral lobe. I owe this spe¬ 
cimen, the most perfect known of this peculiar species, to the kindness of Mr. 
Michael Prendel, of Morris, Ill. 
Odontopteris Bradleyi, Sp. nov. 
PI. viii, fig. 
Nothing is known of this species but the leaflet, which has 
been copied in our figure. It is lanceolate pointed, somewhat 
contracted at its base in a broad pedicel. The veins are 
closely approached, sharply and deeply marked, dichotomous 
in ascending, nearly straight from the base, where they be¬ 
come parallel. The veins and veinlets of this species are too 
close to each other and too numerous to admit it as related to 
0. heterophylla , Lesq., which has its leaflets sometimes pointed. 
It may be compared only to Odontopteris acuminata , LI. and 
Ilutt, of the Oolite. 
In concretions from Mazon creek. 
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