JURASSIC FLORA OF DOUGLAS COUNTY. OREO. 127 



Fig. 7 gives the terminal part of a leaf well preserved. The Schnidtiana 

 type is, as stated, a smaller leaf, also with thin texture and with fewer 

 ultimate segments, often with only four, otherwise the character is 

 much like that of the normal G. sibirica. The ScJunidtiana forms are 

 not so abundant as those of G. sibirica, and they occur in the same local- 

 ities. Fig. 8 gives one of the Schmidtiana leaves having the narrowest 

 ultimate segments, and showing a portion of the petiole. Fig. 9 gives 

 one of the largest leaves of this type, with the widest segments. It is 

 shown considerably enlarged in Fig. 10. Fig. 11 shows the basal portion 

 of a leaf, with medium-sized segments. 



Seeds. — There are in the collections made at the Oregon localities 

 a number of small nut-like seeds that seem to be the seeds of some 

 Ginkgo. They are broadly ovate in form, and in size and shape agree 

 exactly with the seeds attributed by Heer" to Ginkgo sibirica. These 

 seeds vary but little in form and size. It is quite probable that they are 

 in fact the seeds of Ginkgo sibirica, as the leaves of that species often 

 occur with them. The leaves of other species occur with them also. 

 They vary slightly in size and width, some being more narrowly ellip- 

 tical than others. 



Fig. 12 gives one of the smallest and most narrowly elliptical forms, 

 shown enlarged in Fig. 13. Fig. 14 shows two small elliptical seeds, also 

 enlarged in Fig. 15. Fig. 16 denotes one of average size and shape, 

 enlarged in Fig. 17. Fig. 18 gives one of the largest and the most broadly 

 elliptical seeds obtained, enlarged in Fig. 19. 



These seeds are most abundant at locality No. 7. They occur at 

 localities Nos. 14, 18, and 19. 



GINKGOS. OF ABERRANT FORMS. 



Ginkgo sp. Fontaine. 



PL XXXIV, Figs. 1-12. 



Under this head I place certain Ginkgo leaves that do not plainly 

 come under any of the previously described forms. They probably do 

 not belong to any distinct species, but are aberrant leaves of some 

 of the species described in the preceding pages. I note them in order 



« Fl. Foss. Arct., Vol. IV, Pt. II, pp. 61-62, pi. xi, figs. 1.3-17. 



