242 MKSOZOIC FLORAS OF rNirED STATES. 



to l)elonir to this sppcies. The specimens on which tlic former determi- 

 nation was l)asecl are represented in PL L.W'I. lljis. !), 10, and were 

 collected in tlie Horsetown beds near lUddles, Orcg. 



Family ODOXTOPTERIDE.E. 



Genus CTENOPTERIS Brongiiiart. 



Ctenoptekis ixtegrifolia Fmitaine. ? 



PI. LXVI, Figs. 12, 13. 



1889. Ctfnopteris Infcgnfolia Font.: Potomac Flora (Monogr. U. S. Geol. Surv., 

 Vol. XY), p. 1.5S, j)l. Ixii. fig. 2; pi. Ixv, figs. .3, .Sa. 



Among the fossils of the Shasta formation two imprints were found 

 that have a problematic nature. They consist of small fragments of 

 leaves that show only the leases of segments, which have the appearance 

 of a cycad in some points. Although the fragments are small, they are 

 very distinct. The segments are 4 mm. in width, and as the basal 

 portions only are shown their length is not disclosed. They are attached 

 by their entire base to the side of the midrib, are separate to the base, 

 and slightly decurrent on the lower side. The nerves are slender but 

 distinct. They go off oljliquely from the midrib in a parallel manner 

 throughout the entire width of the segment, and in this respect resemble 

 Ctenophyllum and Dioonites. But, unlike these genera, the nerves are 

 forked one or more times at var>dng distances from their insertion on 

 the midrib. The amount of material is entirely too . small to permit 

 a positive determination of this plant, but from its resemblance to the 

 peculiar genus Ctenopteris found in the Lower Potomac of Virginia, and 

 more especially C. integri-folia Font., I have referred the plant to that 

 species. This, however, can be done only with doubt and for the sake 

 of reference. It is to be noted that the Virginia plant was not fully 

 made out, owing to the insufficiency of the material. 



PI. LXVI, Fig. 12, gives a small bit of the' leaf, with the bases of 

 two segments, and Fig. i:^ a portion enlarged, to show nervation. 



This plant occurs at localities Nos.- 1 and 4. 



