XL] 



BAIERA 



45 



type-specimen of the latter species the segments are fewer than 

 in B. Muensteriana, but in some Jurassic forms {e.g. fig. 651) 

 this difference no longer holds good. This is only one among 

 several instances where Rhaetic and Jurassic 'species' cannot be 

 separated by any constant differentiating feature. B. Muenste- 

 riana is recorded also from Persia^ and several European localities, 

 but it is impossible to determine its geographical range apart from 

 that of Baiera gracilis. 



Baiera gracilis Bunbury ex Bean MS. 



The type-specimen of this species from the Middle Jurassic 

 rocks of Yorkshire, as shown in fig. 649, is an impression of an 



Fia. 649. Baiera gracilis. Type- Fig. 650. Baiera gracilis. (British Museum, 39208.) 



specimen of Bunbury (Bun- 

 bury Collection, Botany 

 School, Cambridge). 



imperfect leaf with a fan-shaped lamina deeply divided into forked 

 hnear segments^ : a better example is reproduced in fig. 650. Bean 



1 Schenk (87) B. PI. vin. fig. 44; ZeiUev (05) p. 194. 



2 Bunbury (51) A. p. 182, PI. xii. fig. .3. 



