270 MKSOZOIC KI.OKAS OK rMTKI) STATKS. 



of these, for which tlio specific name clli/ilicum is jji-oposed, was found 

 in a single specimen at locahty Xo. 4 in the Horsetown beds. This 

 shows the entire leaf, with tlic exception of ttie extreme tip. It is 

 small and elliptical in foiin. It is inecjviilateral at l)ase, the midrib 

 being thci-c closer to the margin on one side than on the other. The 

 textuiv of the leaf is thick and firm. A slender midnerve is shown, 

 but the other nervation is indistinct. There ai'e traces of slender nerves 

 that are sent off under a very acute angle and arc dii'ected towai'd the 

 tip of the leaf, as in the Potomac Acacisephvllum. 



ACACI^PHYLLU.M PACII V I'll VI.l.lM I''iillt ilillc II. sp. 



PI. LX IX, Fig. 111. 



The impression, with its reverse, of a small leaf was found at locality 

 Xo. 19, in the Knoxville beds. This leaf is remarkably thick and leathery, 

 so as to obscure all its nervation, even the midrib. This thick character, 

 its shape, and its small size make the imprint left !)}■ it reseml)le some- 

 what that of a luit. It is broadly elliptical in form, with the full width 

 maintained neai-h' to its tip, where it is very obtusely rounded off. It is 

 narrowed gradually to its base, so that it tends to a spatulate form. The 

 midrib is apparently very slender and is not distinctly shown. Xo 

 other nervation is visil)le. In form this leaf very niucli I'eseml^les Acariii- 

 phyllum sjiatulntum Font., of the Potomac beds," but although the 

 texture of that plant is thick, as is characteristic of the Acacispphylla, 

 that of the plant now in question is decidedly thicker. 



GENERAL RF.MAliKs AM) cOXriJ'siOXs. 



This completes the description of all the identifiable plants found 

 in the collections made in the Shasta formation of California and Oregon. 

 The following lists give these plants arranged according to the divisions 

 of the Shasta and Chico formations in which they occur. This grouping 

 will serve to show the distribution of tlie plants in tiic formations, ;ind 

 will indicate any changes that took place in ascending from the Knoxville 

 through the Horsetown beds to tli(> hasc of the Chico, the lowei- member 

 of the Tapper Cretaceous. \ i-cference to the list of localities, with their 

 geological horizons, will show that Xos. 2, 8, and 21 are given as belonging 



a Mono;;!-. IJ. S. (iiMil. Svirv., Vul. XV, ji. 2S(), pi. c.Nxxviii, lit;s. 1, (Ht. 



