THE FOSSIL FLORA OF THE YORKSHIRE COAL FIELD. 59 



distinct, but as seen from the specimens described above, beyond all doubt they only 

 represent different ages of the same plant, and these differences are quite unworthy of 

 any name to distinguish them as varieties or forms. 



Sigillaria semipulvinata shows some similarity to Sigillaria decorata, Weiss,* and 

 Sigillaria subornata, Weiss, t in both of which the leaf-scar is situated towards the top 

 of the cushion. 



In both of these species the leaf-cushion is much smaller and the leaf-scar of a different 

 form, but the character which at once distinguishes Sigillaria semipulvinata from these 

 two species is the position of the leaf-scar in regard to the cushion. 



In Sigillaria decorata, Weiss, and Sigillaria subornata, Weiss, the lateral angle of the 

 leaf-scar is on the same line with the lateral angle of the leaf-cushion which it joins, whereas 

 in Sigillaria semipulvinata the lateral angle of the leaf-scar meets the upper receding 

 boundary line of the cushion some distance above its lateral angle ; or to put it otherwise, 

 the lateral angles of the leaf-scar of Sigillaria decorata and Sigillaria subornata meet in 

 the lateral angles of the leaf-cushion, whereas in Sigillaria semipulvinata they do 

 not. 



Distribution. — Though Sigillaria semipulvinata is rare, I have seen it from several 

 localities, and my thanks are due to those whose names are mentioned in the 

 appended list of distribution for specimens of this interesting Sigillaria. 



Middle Coal Measures. 



Locality. — Cinderford, Yorkshire. 



Horizon— (*). (Late MrE. Tindal, Leeds.) 

 Locality. — Low Moor, Yorkshire. 



Horizon. — Black Bed Coal. (Late Mr J. W. Davis, Halifax.) 

 Locality. — Wharncliffe, Woodmoor Colliery, Carlton, near Barnsley, Yorkshire. 



Horizon. — Kent's Thick Coal. (Mr W. Hemingway.) 

 Locality. — Venture Pit, Burmantofts, Leeds. 



Horizon.— Better Bed Coal. (Mr S. W. Bond.) 

 Locality. — Great Bridge, Worcestershire. 

 Horizon.— (?). (Mr C. Beale.) 



* Weiss and Sterzel, Die Sigillarien d. preuss. Steinh. u. Eothl, Geliete, ii. "Die Gruppe Jer Sub-sigillarien," 

 p. 207, pi. xxvii. fig. 105, 1893, Abhandl. d. Konig. Preuss. geol. Landesanstalt, neue folge, Heft. ii. Berlin. 

 + Ibid., p. 209, pi. xxvii. fig. 106, 1893. 



