BAIERA. 265 



probable ttat the short synonymy given for Baiera gracilis might 

 te 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 Baiera forms, demonstrate the futility of 

 attempting to draw definite lines between one species and another 

 when we have onlj? mere fragments to guide us. 



39.208. PI. IX. Fig. 5. 



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

 vary considerably as regards the number of liuear 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 leai-stalk measures 7 cm. Specimens 

 •of Baiera Lindleyana occiu' iu association with the leaves of 

 B. gracilis. Labelled by Bean Schiwpteris 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 Baiera Muensteriana ^ and B. gracilis ^ ; 

 also Schenk's figui-es of Jeanpaulia Muensteriana? 



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 

 be expressed by speaking of such examples as that shown iu 

 Fig. 3 as Baiera gracilis, forma 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. 

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

 3 Schenk (67), pi. ix. 



