414 
PALAEONTOLOGY OF ILLINOIS. 
Hymenopiiyllites inflatus, Sp. nov. 
PI. xvi, fig. 6. 
A tripinnately divided part of a frond, with primary divi¬ 
sions broadly oval in outline pinnately cut into alternate ob- 
ovate obtuse inflated lobes, either simple or parted again in 
short obtuse divisions; nervation obsolete, the veins appar¬ 
ently branching in each division of the leaves, and simple. 
This species is intermediate between the two sections of Hymenophi/llites, 
having the mode and regularity of division of the first, the thick inflated leaflets 
without distinct nervation, like some species of the second. It is distantly re¬ 
lated to Sjphenopteris Rutsefolia, Gutb., Verst., p. 42, pi. x, fig. 10 and 11, from 
which it differs by the form of its more elongated, narrow, inflated pinnules, 
by the obsolete nervation, etc. 
From the roof shales of the main coal, Duquoin. 
The specimen is a large piece of shale covered with fragments of the plant, 
none larger than the one figured. ’«.* ! ■ 1 7 ■ p, C J ■, ■ \ - .A / 5 > 
1, / / / 
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§ 2. Apiilebia. 
)' f Hymenopiiyllites adnascens, LI. and Hutt. 
, Ail({ 7. ? 
The two specimens figured, pi. xvi, fig. 7 and 8, from the roof shales of the 
coal at Morris, exactly represent the species of Lindley, as it is figured and de¬ 
scribed by Geinitz, in his Versteinerungen, p. 20, pi. xxv, fig. 7 to 9. But I 
cannot recognize an identity between the plants represented in these figures. The 
one, fig. 8, of ours, has the lower divisions short lanceolate obtuse, irregular 
in their directions, with thin parallel veinlets, and the upper ones narrower, 
curved, marked also by thin parallel veins branching into each lobe ; while 
the other, fig. 7, has dichotomous or forking, linear, narrow branches, without 
trace of veins or veinlets. The first of these forms agrees with the description 
and figures given by Lindley, vol. 2, p. 58, pi. C and Cl, who compares the 
plant to some Lygodium or Hymenophyllum, but I am disposed to consider the 
other as a peculiar species. Our fragments are nevertheless too small to allow 
a precise and satisfactory description. Prof. Lindley considers his species as 
a climbing fern, twisted round the stem of a frond of Splienopteris crenata , to 
