FOSSIL PLANTS. 437 



figured pi. 34, fig. 3 and 3 a. It does not differ from the 

 European species. Only in ours the nervation, till now unde- 

 scribed, is, though obsolete, distinct enough for examination. 

 The main or medial nerve is formed from a facicle of very thin, 

 filiform, parallel veinlets forking with its division, percurrent 

 or running to the margin, where they still appear double. 

 This nervation renders the base of the leaflets and the common, 

 somewhat winged rachis, inflated or thickened in the middle. 

 It is thus a true Hymenophyllites, more properly belonging to 

 the second division {Pacliypliyllmii) . This species was found 

 at Colchester. Coal No. 3. 



HymenopliyUites alatus, Brgt. PL 39, fig. 1. 



Splienopteris alata, Brgt. Hist, des Veg. Foss., 1, p. 180, tab. 

 48, fig. 1. Our species is apparently identical with that of 

 Europe, but like most of our other species of fossil plants, it 

 has some peculiar characters, which do not perfectly accord 

 with the typical form. The. lobes or divisions of the pinnee 

 .are not perpendicular on the rachis, as in M. Brongniart's figure, 

 but oblique and much more approached to each other; and the 

 veins, pretty thick at and near the base, become thinner in 

 ascending and dividing, and are lost or obsolete near the mar- 

 gins. A fruiting specimen, figured by Geinitz, Verst., tab. 24, 

 fig. 15, resembles our American form more than Brongniart's. 

 Locality : Roof shales at Colchester. A good specimen of this 

 species has recently been found at Morris, Grundy county — 

 showing that our species is identical with the European. 



Hymenophyllites liirsutus? Lsqx. 



Pachyphyllum hirsutum? Lsqx. Geol. Rept. of Penna., p. 863, 

 tab. 8, fig. 3. The specimens are too small for a satisfactory 

 examination. The surface of the stem is hairy, but the lobes 

 or divisions are more obtuse than in the Pennsylvania speci- 

 men. Mazon creek, Grundy county. Coal No. 3. 



