IS 
l 
422 
PALAEONTOLOGY OF ILLINOIS. 
Sphenophyllum filiculmis, Lesqx., Geol. Rep. Penn., p. 853 
PI- i, fig 6 . 
Nodule from Mazon creek ; F. H. Bradley. 
Fruiting catkins of Sphenophyllum, referable to AsterophyHites ovalis, Lesqx. 
Penn. Geol. Rep., p. 851, pi. i, fig. 2, are found in the concretions of Mazon 
creek, and in the shales of Morris. 
3 
. 
Genus ANNULARIA, Brgt. Ill. Geol. Rep., vol. II, p. 444. 
' $///<')»’/>/•'. i‘ : t ■ 
J, “ t/ ' 
J on f . ' 
Annularia longifolia? Brgt. 
PI. xxi, fig. 1 to 3. 
Stem thick, round, narrowly and equally striate, articulate, 
divided into opposite diverging branches placed crosswise in 
ascending, bearing at the articulations whorls of ovate-lance¬ 
olate obtusely pointed flat leaflets, marked by a broad medial 
nerve. 
This species is represented in the concretions of Mazon creek, by two kinds 
of specimens, with different appearances. Those figured in our plates seem to 
belong to the upper, still undeveloped part of the plant. The branches and 
leaflets are crowded and pressed upon one another in a scarcely distinguishable 
mass, presenting sometimes, as in fig. 1, the appearance of a peculiar species 
of Sphenophyllum. In fig. 2, the branches and leaves are more distinct, and 
the form of the leaflets is distinguishable as marked fig. 3, magnified. On an¬ 
other specimen, which was obtained too late to be figured, and which shows 
the plant in its full development, the stem about one foot long, half an inch 
thick at the base, regularly striate in length, is articulate at the distance of one 
inch by whorls of leaves of the form described above, and two opposite branches 
diverging in open angles from under the leaves, and crosswise in ascending. 
The leaflets, one inch long, one-sixth of an inch broad, twelve to fourteen in 
each whorl, are joined at their base. The point of attachment of the leaflets 
upon the stem and the branches, is marked around the articulation by small, 
semi-lunar inflations or knots, corresponding in number with the leaflets, and 
placed just above the point of attachment. The plant represented by the two 
specimens figured, pi. 21, can be compared with what Prof. Geinitz has des¬ 
cribed and figured in his Verst., p. 10, pi. 16, fig. 1, under the name of Astero- 
phyllites foliosus, LI. and Hutt. The form of the leaflets being indistinguisha- 
