68 MESOZOIC FLORAS OF FXITED STATES. 



are includod the Pccoptcn's trhilbicnsis Brongn. and the Pecojitcris tenuis 

 Schouw, descnl)ed l\v Brongiiiart. These he considers as identical with 

 Pecopteris Williamson is. all l)eiiifi Todites. To these forms he gives the 

 name Todites Williainsoni. In the paper on tlie plants of the Manchester 

 Museum, pi. i, figs. 1, 2. he gives reproductions of two rather poorly pre- 

 served specimens of Todites Williamsoni, that, with the exception of the 

 smaller size of the pinnules, and the serration of their margins, agree pretty 

 well with the Oregon plant. PL xxi, fig. 6, of his Yorkshire Jurassic 

 plants, gives as this plant a fern that seems to have pinnules witli entire 

 margins. This is exactly like the Oregon fossils. In the absence of 

 fructification with the latter it can not be made a Todites notwithstanding 

 this close similarity. 



PI. X, Fig. S shows parts oi several ultimate pinna* so placed as to 

 indicate a former attachment to a common rachis. Fig. 9 gives a magni- 

 fied pinnule to show the ner\'ation. Fig. 10 gives a portion of an ulti- 

 mate pinna, with pinnides more remote than is common. Fig. 11 shows 

 a pinnule of this enlarged, with nervation in detail. Fig. 12 shows the tip 

 of an ultimate pinna, with shorter, more triangular, and more imited 

 pinnules than is common in such situations. 



This is one of the rarer ferns and where it occurs l)ut few specimens 

 were found. It occurs at the locality Xo. 19" most commonly, and is 

 found also at locaUties Xos. 1, 2, 6, 7, 17, and 18. 



Cladopiilebis denticulata (Brongniart) Nathorst non Fontaine. 



PI. XI, Figs. 1-7. 



1828. Pecopteris denticulata Brongn. [non Heer]: Prodrome, pp. 57, 198 (nomen). 



1828. Pecopteris PhUlipsii Brongn.: loc. cit. (nomen). 



1829. Pecopteris lif/ata Phill.: Geology of Yorkshire, pp. 148, ISO, pi. viii. fig. 14. 



1833. Neuropteris tigata (Phill.) L. &. II.: Foss. Fl. Gt. Brit., Vol. I, j). I!i7, ])1. 



Ixix. 



1834. Pecopteris insignis L. & H.: op. cit.. Vol. II, p. 69, pi. cvi. 

 1834. Pecopteris undans L. & H.: op. cit.. Vol. II, p. 103, pi. cxx. 



1834. Pecopteris denticulata Brongn.: Hist. Veg. Foss., Vol. I, p. 301. pi. xcviii, 



figs. 1, lA, IB, 2, 2A. 

 1834. Pecopteris PMUipsii Brongn.: op. oil.. Vol. 1, p. 304, pi. cix, figs. 1, lA. 

 1836. PIdebopteris ? undans (L. & II.) Brongn.: op. cit.. Vol. I, p. 375, pi. cxxxiii, 



figs. 3, 3A, 3B 



a The specific name alludes to this locality (bed of Cow Creek). — L. F. W. 



