94 MKSO/OIC FLORAS OF UNITKD STATES. 



XlLSOXIA MPPOXENSIS "^'(ikoyailia. 



PI. XVII, Figs, s 10. 



1889. Nilsonia nipponensis Yok.: Joiirii. Coll. Sci. Imp. Fniv. Japan, Vol. Ill, 

 Pt. I, p. 42, ]il. vi, fig. S(l; pi. ,xii, ficr. d; pi. xiii, iig. 1. 



Several specimens of a plant were found at localities Xos. 2 and 

 14 that agree closely with Yokoyama's Nilsonia Jiippovcnsis, except 

 that the segments are not quite so much rounded off on the posterior 

 margins of the ends. Yokoyama's specimens, however, seem to l^e 

 somewhat distorted, and even this unimportant difference may be 

 accounted for in that way. It is probable that several of the forms 

 fi'om the Jurassic of Siberia, called by Heer Pterophyllum and Anomoz- 

 amites, belong to the same species. Their segments agree exactly in 

 form, and the appearance of the midrib may be due to the fact that 

 the lower surface of the plant is presented uppermost. The forms 

 alluded to are Anomozamites Schmidtii and Pterophyllum Hdmersenianum . 

 The segments of this plant are broad and short. The nerves are slender, 

 but sharply defined. They are simple and parallel to one another and 

 to the margins of the segments. 



The fragment given in PL XVII, Fig. 8, is apparently from the 

 middle part of a leaf. Fig. 9 shows several segments of this enlarged. 

 Fig. 10 shows the basal part of a leaf and illustrates the tendency to 

 irregularity of the segments in this part of the leaf. The segments 

 on opposite sides of the midrib are (juite unequal in width, and at the 

 enfl of the fragment the segments are succeeded by a narrow lamina 

 on each side that is entire. The midrib of this specimen has great 

 strength. 



Nilsonia compta (Phillips) Goppert. 



PI. XVII. Fi<r.s. 11-14. 



1828. Pterophyllum Williamsonis Brongn. : Prodrome, pp. 95, 199 (nomen)." 



1829. Cycadites comptus Phill.: Geology of Yorkshire, pp. 148, 189, pi. vii, fig. 20. 

 1833. Pterophyllum comptum (Phill.) L. & IL: Fo.ss. Fl. Gt. Brit., Vol. I, p. 187, 



pi. Ixvi. 



"As no description orfipire ever acconipaiiicd the use of this name it may.ahhoiigli antedating all othei's, 

 be dropped as a noraen iiudiini; .still, as Brongniart in his Tableau, 1S49, distinctly enters it as a synonym 

 of NUnonia compta, and as numerous authora (Morris, Gijppert, Unger, etc.) have introduced it into the 

 literature, it can not well be omitted from the svnonvmv. — L. F. W. 



