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 Asterophyllites 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. 



GENUS ANNUL ARIA, Brgt. 111. Geol. Rep., vol. II, p. 444. 

 ANNULARIA LONGIFOLIA? Brgt. 



PL 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 fiirurcd, 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- 

 phyUitcs foliosus, LI. and Hutt. The form of the leaflets being indistinguisha- 



