128 MESOZOIC FLORAS OF UNITED STATES. 



that some idea nia\- be formed of the numerous variations occurring 

 in the Oregon Ciinkgos. I do not give all that might be selected. 



PL XXXIV, Fig. 1, shows a very small leaf with segments only at the 

 simimit of the leaf, shown enlarged in Fig. 2. They are not fully preserved. 

 This leaf has some likeness to the small leaf given 1>>- Seward on pi. ix, 

 fig. 8, of his Jurassic Flora of the Yorkshire Coast, and named Ginkgo 

 xvhitbiensis Nathorst. The segments are not so long and acute as those 

 of Yorkshire, but they are not well preserved. It occurs at locality 

 No. 7. Figs. 3 and 4 (enlargement) give a very small leaf with three 

 elliptic segments, occuring at the same locality. Figs. 5 and 6 (enlarge- 

 ment) give a larger leaf, hardly at all segmented, found also at locality 

 Xo. 7. Figs. 7 and 8 (enlargement) denote a small leaf with four broad 

 irregular segments. This also occurs at locality' Xo. 7. Figs. 9 and 10 

 (enlargement) represent another form found at locality Xo. 7. It is 

 a petiole, bearing at its summit a pair of small leaves with three seg- 

 ments each. Figs. 11 and 12 (enlargement) show a form from locality 

 No. 18 that contains three narrow segments at the summit of a slender 

 petiole. It resembles the form figured by Sew^ard, op. cit., pi. ix, fig. 4, 

 and named Baiera Phillipsi Nath. 



Genus PHCENICOPSIS Heer. 



Phcenicopsis 'i sp. Fontaine. 



PI. XXXrV, Figs. 13, 14. 



Several fragments of strap-shaped leaves that at least suggest the 

 presence of the genus Phoenicopsis were found in the Oregon Jurassic. 

 They are quite rare, only two being found at locality No. 2, and one at 

 locality No. 7. They are too poorly characterized to determine anything 

 definite regarding them. They are strap-shaped fragments, which do 

 not show either liase or summit. They do not narrow at all from one 

 end to the other. Their margins are strictly parallel. The widest of 

 them are 8-10 mm. wide, and the smallest are but a little narrower. 

 In at least one case several fragments occurring together converge at 

 one end, as if to a common point. The leaf texture seeflis to have been 

 thin. There are so far as seen no well-defined nerves, but a fine striation 

 is shown on the surface. These fragments suggest Heer's species Pkce- 

 nicopsis speciosa." 



a n. Foss. Arct., Vol. IV, Pt. II, pp. 112-113, pi. xxix, figs. 1 (excl. Ic, Id.), 2; pi. xxx. 



