CARBONIFEROUS. 179 



specimens of Sigillaria discophora, we have no course left but to unite the 

 two. Portions of some of those examples of Sigillaria discophora, to which 

 I have referred, might be broken off from those parts where the large scars 

 do not occur, and would be indistinguishable from Sigillaria Preuiana, 

 Bonier. 



Horizon. Coal Measures. 



Localities. British. Lanarkshire : near Carluke (Presented by the British 

 Association) ; Shott's Iron Works. Northumber- 

 land : Newcastle- on -Tyne (Specimen figured as 

 Ulodendron Stockesii by Mr. Carruthers, Monthly 

 Micro. Journ. 1870, vol. iii. pi. xliv. fig. 3.) Stafford- 

 shire : Low Moor (Cast). Worcestershire : Bewd- 

 ley. Yorkshire : Boldshaw, Bradford Moor, Brad- 

 ford; Wakefield. (No more definite locality than 

 Yorkshire is given for the type of Ulodendron 

 pumilum, Carruthers, Monthly Micro. Journ. 

 1870, vol. iii. pi. xliii. fig. 2.) No locality. Cast 

 of Sigillaria (Lepidodendron discophora, Konig., 

 sp., figured in Icones Fossilium Sectiles, pi. xvi. 

 fig. 194). 



Sigillaria Taylori, Carruthers, sp. 



Ulodendron Taylori. 



Carruthers, Monthly Micro. Journ. vol. iii. p. 152, pi. xliii. fig. 1, 1870. 

 Ulodendron minus. 



Thompson, Trans. Edinb. Geol. Soc. vol. iii. p. 341, pi. (B). 



Lepidodendron Veltheimianum. 

 Stur (in part), Culm Flora, heft 2, pi. xxxix. figs. 1, 2. 



Remarks. The form of the leaf-scars is not well shown on the type 

 specimen of this species. They are better shown on the three other figures 

 of this plant which have been given under the names of Ulodendron minus 

 and Lepidodendron Veltheimianum. It is difficult to understand how Dr. Stur 

 has included his two figures of Sigillaria Taylori under Lepidodendron 

 Veltheimianum, as no state of preservation or age could account for the 

 leaf-scars of Lepidodendron Veltheimianum becoming so altered as to assume 

 the form and arrangement of those on his pi. xxxix. figs. 1, 2. His figure 1 

 shows an older condition of Sigillaria Taylori than his figure 2. The right 

 hand upper corner of this last-mentioned figure indicates clearly the 

 Sigillarian form of the leaf -scar, and how close are the affinities of this species 

 with Sigillaria discophora. (Compare Mr. Carruthers' figure of this last- 

 mentioned plant under the name of Ulodendron pumilum, Monthly Micro. 

 Journ. vol. iii. pi. xliii. fig. 2.) Prof. D'Arcy Thompson has figured an 

 example of this species with the lower portion of the appendicular organ 

 attached. The Clathrarian form of the leaf-scars is well shown on his figure, 

 but even better on his specimen, which he has kindly lent me for exami- 

 nation. I have already referred to an example collected by Dr. Macfarlane, 

 which shows the appendicular organs, in a young condition, attached to the 

 stem.* 



Horizon. Carboniferous Limestone Series. (Also occurs plentifully in the 

 Calciferous Sandstone Series.) 



Locality. British. Linlithgowshire : Bathgate. (Type.) 



Sigillaria Brardii, Brongniart. 



Sigillaria Brardii. 



Andrae, Jahrb. d. Naturwiss. Vereines, Halle, 1850, p. 123. 

 Brongniart, Prodrome, p. 65. 



* See ante, p. 164. 



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