JURASSIC FLORA OF DOFCiLAS COUNTY. ORKO. 127 



Fig. 7 gives tlio trrniinal pai't of a leaf woW preserved. TIh^ Srlniiullinna 

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

 ultimate segments, often with only four, othei'wise the chai'acler is 

 much like that of the normal (/. sihin'fd. The SchniiilUiiiin forms are 

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

 ities. Fig. S gives one of the SchmidlidiKi l(>aves having the narrowest 

 idtimate segments, and showing a jjortion of the petiole. Fig. 9 gives 

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

 shown considerablN- enlarged in Fig. 10. l''ig. 1 1 .shows the basal poilioii 

 of a leaf, with medimn-sized segments. 



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

 a numl)er of small mit-like seeds that seem to be the seeds of some 

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

 exactly with the seeds attrilmted liy Heer" to (riiiLyn sihirica. These 

 seeds vary but little in form and size. It is (juite probal>l(> that th(\v are 

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

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

 They A-aiy slight 1\- in size and width, some being more narrowly elhp- 

 tical than others. 



Fig. 12 gives one of the .smallest and most narrowly ellii)tical forms, 

 shown enlarged in Fig. VS. Fig. 14 shows tw^o 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 brf)adly 

 elliptical seeds ol)tained, enlarged in Fig. 19. 



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

 localities Nos. 14, 18, and 19. 



GINKGOS OF ABERRANT FORMS. 



Ginkgo sp. Fontaine. 



PI. XXXIV, Figs. 1-12. 



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

 come under an\- of the previously described forms. They probably do 

 not belong to any distinct species, l)ut are aberrant leaves of some 

 of the species described in the preceding pages. I note them in ordei- 



«F1. Foss. Airt., Vul. IV, Pt. II, pp. (n-(V2, pi, xi, fi<rs. 13-17 



