10 ME. E. A. NEWELL AEBER ON THE [Feb. I903, 



Alethopteeis, Sternberg, 1820. 

 ' Versuch einer geogn.-botan. Darstell. d. Flora d. Vorwelt ' pt. i, fasc. iv, p. xxi. 



Alethopteeis Seeli (Brongt.). 



Woodwardian Mus. Camb., Carb. Plant Coll. No. 937. 

 Local it}'. — Bransty Cliff, Whitehaven. 



Pecopteris Serli. 



1828. Brongniart, ' Hist, des Veget. foss.' p. 292 & pi. lxxxv. 



1831-37. Lindley & Hutton, ' Foss. Flora ' vol. iii, pi. ccii. 

 Aletliopteris Serli. 



1886. Kidston, ' Catal. PaLeoz. Plants Brit. Mus.' p. 135. 



1886-88. Zeiller, ' Bassin houill. de Valenciennes ' p. 234, pi. xxxvi, figs. 1-2 & 

 pi. xxxvii, figs. 1-2. 



1900. Zeiller, ' Eleni. de Paleobot.' p. 95, fig. 68. 



Cordaitales. 



Coedaites, Unger, 1850. 

 ' Genera & Species Plantarum fossilium ' p. 277. 



1. Coedaites peincipalis (Germar). 



Woodwardian Mus. Camb., Carb. Plant Coll. Nos. 942-45. 

 Locality. — Bransty Cliff, Whitehaven. 



Cordaites principalis. 



1886. Kidston, ' Catal. Palaeoz. Plants Brit. Mus.' p. 207. 



1886-88. Zeiller, ' Bassin houill. de Valenciennes ' p. 629, pi. xciii, fig. 3 & pi. xciv, 

 fig. 1. 



2. Coedaites sp. 



Woodwardian Mus. Camb., Carb. Plant Coll. Nos. 725-28. (Sedgwick Coll.) 

 Locality. — The coast at Whitehaven. 



Sternberg ia approximata . 



1831-37. Lindley & Hutton, ' Foss. Flora ' vol. iii, pis. ccxxiv & ccxxv. 

 Sternberqia. 



1886. Kidston, ' Catal. Paheoz. Plants Brit, Mus.' p. 221. 

 Artisia approximata. 



1886-88. Zeiller, ' Bassin houill. de Valenciennes ' p. 634 & pi. xciv, figs. 2-3. 

 \JDadoxy~lon approximation .] 



1851.' Williamson, Mem. Lit, & Phil. Soc. Manch. ser. 2, vol. ix, p. 340 & figs. 1-11. 

 Cordaites. 



1899. Potonie, ' Lehrb. d. Pflanzenpal.' pp. 266-67, fig. 253. 



B. The Productive Measures. 



The Productive Measures contain three great coal-seams, which 

 form the most important horizons in the Cumberland Coalfield 

 from the economic standpoint. They are, for the most part, of 

 constant thickness, and are easily traced throughout the district, 

 although known locally under different names. 1 The thickest seam 

 is known at Whitehaven as the ' Main Band,' and is there 10 feet 

 thick. At the William Pit, Whitehaven, it lies 455 feet below the 

 base of the Sandstone Series, and 576 feet from the surface. In 

 the northern portion of the area, in the neighbourhood of Mary- 

 port, this seam is split into an upper, or ' Metal Band/ and a lower, 



1 J. D. Kendall (83) p. 340. 



