680 PROFESSOR A. C. SEWARD ON 



described by Dunker * from Wealden rocks as Cyclopteris digitata, but in the German 

 specimens the segments are rather broader. The two species G. sibirica and G. lepida 

 Heer represent the same type as the Gartymore plant. G. sibirica is a widely spread 

 species ; it is recorded by Fontaine from Jurassic strata of Oregon, t by Newton and 

 Teall from Franz Josef Land,| by Dawson from the Lower Cretaceous of Canada,§ 

 and by myself from Jurassic beds in Turkestan, || also by other authors from various 

 regions. The specimens described by Yokoyama as G. cf. lepida^ from Japan are 

 probably identical with G. sibirica ; a similar type is represented also by the same 

 author's G. jiabellata** from the Jurassic of China. Ginkgo Schmidtiana var. 

 parvifolia tt figured by Krasser from China is another example of a similar or possibly 

 identical type. 



Baiera, Braun. 

 Baiera Brauniana (Dunker). (Text-fig. 9, B.) 



1846. Jeanpaulia Brauniana, Dunker, Wealdenbildung, p. 11, pi. v. fig. 4. 

 1849. Baiera Brauniana, Brongniart, Tableau, p. 107. 



The imperfect leaf represented in text-fig. 9, B, bears a close resemblance to the 

 Wealden species Baiera Brauniana as figured by Dunker and by Schenk^J; from 

 Germany. One of Dunker's specimens referred by him to this species is no doubt a 

 badly preserved piece of a deeply lobed Hausmannia. In the Culgower fragment the 

 narrow linear segments have more than one vein, as seen in the enlargement, and are 

 certainly not the divisions of a Hausmannia leaf. Nathorst's fossil from the Upper 

 Jurassic of Spitzbergen, B. spetsberge?isis,§§ in which the venation is not seen, represents 

 a similar form with rather narrower segments. It is possible that Bunbury's species 

 B. gracilis \\\\ from the Inferior Oolite of Yorkshire may be identical with the Culgower 

 type, but in his species the leaves are usually broader and more spreading. The plant 

 figured by Heer as B. angustifolia^ from the Jurassic of Siberia and the Chinese Jurassic 

 specimens referred by Schenk to Heer's species are probably identical with B. gracilis, 

 as also Krasser's specimens which he refers to Ginkgo lepida.*** Heer's Ginkgo 

 concinna^ from Siberia is a closely allied type, and the Rhsetic species described 

 by Zeiller from Tonkin as B. Guilhaumati\\\ is hardly distinguishable from the 

 Sutherland leaf. 



Ginkgoales (?). 



Baiera Lindleyana (Schimper). (PI. V. fig. 105.) 



The fragment represented in fig. 105 is too imperfect to determine with any degree 

 of confidence. It agrees very closely with the type-specimen of Baiera microphylla 



* Dunker (46), pi. i. fig. 8. t Ward (05), pi. xxxiii. { Newton and Teall (97), pi. xxxviii. 



§ Dawson (85), pi. ii. || Seward (07), pi. vii. IT Yokoyama (89), pi. xiv. 



** Yokoyama (06), pi. vii. tt Krasser (05), pi. ii. fig. 5. 1J Schenk (71), pi. xxiv. 



5$ Nathorst (97), pi. iii. |||| Bunbury (51), pi. xii. ; see also Seward (00), p. 263 

 IfH Hebh (78), pi. vii. *** Krasser (05). 



ttt Hbbb (77), pis. vii., xiii. JJJ Zeiller (03), p. 205. 



