34 ME. E. A. JEWELL AEBER ON [Feb. 1909, 



We thus find in the Waldershare and Fredville Series themixture 

 of Upper Coal-Measure and Middle Coal-Measure species, which is 

 characteristic of the flora of the Upper Transition Series. Annularia 

 stellata (Schloth.) and A. sphenophylloides (Zenker), the latter 

 occurring infrequently in the Middle Coal-Measures, Neuropteris 

 rarinervis, Bunb., Odoniopteris lindleyana, Sternb., Alethopteris serli 

 (Brongn.), Pecopteris arhorescens? (Schloth.), and Sphenopteris 

 neuropteroides (Boulay) are all typical Upper Coal-Measure species. 

 Neuropteris scheuchzeri, Hoffm., like N. rarinervis (Bunb.), is 

 probably more abundant generally in the Transition Series and 

 Upper Coal-Measures than in the Middle, while Alethopteris serli, 

 Brongn., is very infrequent in the Middle Coal-Measures. Pecopteris 

 miltoni (Artis) appears to be almost equally abundant in the three 

 upper horizons, though perhaps somewhat less so in the Middle 

 Coal-Measures than in the higher series. 



On the other hand, in Sphenophyllum cuneifolium (Sternb.), 

 Neuropteris tenuifolia (Schloth.), N. obliqua (Brongn.), Alethopteris 

 lonchitica (Schloth.), Cordaites principalis (Germar), and Eremopleris 

 artemisicefolia (Sternb.), we find species which are chiefly abundant 

 in the Middle, or in both the Middle and Lower Coal-Measures. 



The horizon of the Waldershare, and also of the 

 Fredville Series, is tlius the Upper Transition Series^ 

 and these beds are consequently the homotaxial equivalents of the 

 following deposits in other British coalfields : — 



Coalfield. Series. 



! Newcastle-under-Lyme. 



North Staffordshire x I Etruria Marl. 



I Blackband Group. 



a ti en. nr t \ • 1 ' Hamstead Colliery, Great Barr, 



South Staffordshire j bdow ^ feet *' 



„,.,,., j Ccedyrallt. 



Denbighshire | Ruabon Marls _ 



I Ardwick Series. 



South Lancashire 4 Bradford Colliery, above the 



Bradford Four-foot Coal. 



South Wales 5 Lower Pennant Grit. 



c . „ I" New Bock. 



Somersefc IVobster. 



We may now compare the floras of the Waldershare and Fredville 

 Series with that of the Dover Series. The species recorded by 

 Prof. Zeiller, see p. 24, were not sufficiently numerous to indicate 

 the horizon directly. In 1892, he concluded provisionally, chiefly 

 from the occurrence of Neuropteris rarinervis, Bunb. and iV. 

 scheuchzeri, Hoffm., that the Dover Series belonged to the upper 

 region of the Middle Coal-Measures (' Blouiller moyen '), and was not 



1 The 'Staffordian' of Dr. Kidston's new classification (05) p. 320, which 

 however I am unable to accept, see p. 37. 



2 Kidston (05) p. 313. 3 Id. (05) p. 314. 

 4 Arber(03); Gerrard (04) ; Kidston (05) p. 320. 



* Kidston (94) pp. 573-74. 6 Id. (87). 



