68 MESOZOIC FLORAS OF UNITED STATES. 



are included the Pecopteris whitbiensis Brongn. and the Pecopteris tenuis 

 Schouw, described by Brongniart. These he considers as identical with 

 Pecopteris Williamsonis, all being Todites. To these forms he gives the 

 name Todites Williamsoni. In the paper on the plants of the Manchester 

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

 served specimens of Todites WiUiamsoni, 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 with 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 similarit)^ 



PL X, Fig. 8 shows parts oi several ultimate pinnae so placed as to 

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

 fied pinnule to show the nei-vation. Fig. 10 gives a portion of an ulti- 

 mate pinna, with pinnules 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 united 

 pinnules than is common in such situations. 



This is one of the rarer ferns and where it occurs but few specimens 

 were found. It occurs at the locality No. 19" most commonly, and is 

 found also at localities Nos. 1, 2, 6, 7, 17, and 18. 



Cladophlebis denticulata (Brongniart) Nathorst non Fontaine. 

 PI. XI, Figs. 1-7. 



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



1828. Pecopteris Phillipsii brongn.: loc. cit. (nomen). 



1829. Pecopteris ligata PhilL: Geology of Yorkshii'e, pp. 148, 189, pi. viii, fig. 14. 



1833. Neuropteris ligata (Piiill.) L. & H.: Foss. Fl. Gt. Brit., Vol. I, p. 197, pi. 



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 PMllipsii Brongn.: op. cit., Vol. I, p. 304, pi. cix, figs. 1, lA. 

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



figs. 3, 3A, 3B 



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



