BAIEUA. 265 



X^robable that the short synonymy given for Baicra gracilis might 

 be considerably extended without great risk of error. The number 

 of fossil leaves described by Heer and other authors, which exhibit 

 every stage in the transition from the obvious Ginkgo type to 

 the narrow lobed Baicra forms, demonstrate the futility of 

 attempting to draw definite lines between one species and another 

 when Ave have only mere fragments to guide us. 



39.208. EL IX. Fig. 5. 



A large piece of rock with impressions of several leaves, which 

 vary considerably as regards the number of linear segments. 

 The example figured agrees with Bunbury's type-specimen, and 

 represents a fairly common form of the species. The tips of 

 the segments are obtusely pointed ; in some of the leaves the 

 segments are longer than as shown in Fig. 5 and less spreading, 

 as in some of the examples of Jeanpaulia Muensteriana figured 

 by Schenk. The longest leaf-stalk measures 7 cm. Specimens 

 of Baicra Lindhgana occur in association with the leaves of 

 B. gracilis. Labelled by Bean Schizopteris gracilis. 



39.209. PI. IX. Fig. 3. 



In this example the segments are more numerous than in the 

 type-specimen or in 39,208 (PI. IX. Fig. 5), but the general 

 habit of the leaf is similar to that of the specimens with few 

 segments. The leaf is about 10 cm. broad, 4'5 cm. high. 

 f . Saporta's figures of Baicra Muensteriana l and B. gracilis 2 ; 

 also Schenk's figures of Jeanpaulia Muemtcriana. 3 



In each segment there are a few parallel veins, but these are 

 not clearly shown. The practical identity of this form of leaf 

 with that of Jeanpaulia Muensteriana, as figured by Schenk, may 

 bo expressed by speaking of such examples as that shown in 

 Fig. 3 as Baicra gracilis, forcna Muensteriana. 



Scarborough. Bean Coll. 



V. 2524. Labelled by Bean Schizopteris gracilis. One of the 

 leaves of Baiera gracilis shown on this slab of rock has narrower 



1 Saporta (84), pi. clvi. fig. 1 ; pi. clvii. figs. 1 and 2. 



2 Ibid. pi. clvii. fig. 4 ; pi. clviii. 



3 Schenk (67), pi. ix. 



