CARBONIFEROUS LYCOPODS AND SPHENOPHYLLS. 97 



alternating with those on the other side. I only know o£ two 

 species belonging to the Sigillarice which bore their fructification 

 in this manner, and both belong to the Clathraria group. One 

 of these is Sigillaria discophora. Konig sp.' (^=Ulodeudron 7)iinus, 

 L. & H.-). The leaf-scars of this species are characteristically 

 Clathrarian, and on a specimen from Bonnyton Pit, Kilmarnock,^ 

 the three cicatricules are distinctly preserved (No. 1298).* 



The other species is the Sigillaria Taylori, Carr. sp.,^ from the 

 Carbonifei'ous Limestone and Calciferous Sandstone Series. The 

 leaf-scars are small, but also Clathrarian. 



In these two plants the sessile cones are borne on the older 

 stems, and the cup-like depressions on the bark have been caused 

 by the pressure of the base of the cone, but after the fall of the 

 cones — which seem to have been caducous in all the Sigillaria — 

 the cup-like depressions, as well as the leaf-cushions and scars, 

 increased in size as the bark increased in diameter with the 

 growth of the trunk, though in old stems the bark also becomes 

 longitudinally fissured, as in some Lepidodendra. On a specimen 

 of Sigillaria discophora from near Halifax, which was given to 

 me by Mr. William Cash, F.G.S., the cone- scar is fully 5 inches 



1 Konig, Icones fogtiiium sectiles. London, 1825. The first part. Plates 

 I.-VIII., was issued iu 1825. The subsequent parts are said not to have 

 been issued. It is quoted, however, by Broun in Inaex Palceontoiogicw!, 

 Stuttgart, 1848. The Sigiliaria ( LepidodendronJ dixcophora occurs on 

 PI. XVI., fig. 194. If it is the case that this plate was never issued publicly, 

 then Lindley and Huttou's name of Si'jillaria ( Uiodendron J inajus should 

 have priority, but as there is still doubt as to what plant the Ulodendron 

 maJKs, L. & H., reallj' represents, the use of Kouig's name prevents all 

 confusion. I believe U. majus, L. <k H., and U. minus, L. & H., 

 represent different ages of the same species. V. minut, L. & H., is 

 certainly the Sigillaria discophora, Konig sp. A cast of Kcinig's specimen 

 is contained in the collection of the British Museum (Geol. Department), 

 and the counterpart of the type of U. minus is in the Hutton Collection, 

 Newcastle-on-Tyne. 



2 Lindley and Hutton, Fossil Flora, Vol. I., PI. VI. 1831. 



^ From Shale over the Whistler Seam, Lower Coal Measures. Received 

 from the Rev. D. Landsborough. 



* Kidston, Proc. Roy. Phys. Soc. Edin., VoL X., p. 91, PI. IV., fig. 1 ; 

 also, Annah and Mag. Nat. Hist., Ser. 6, Vol. IV., PI. IV., fig. 1. 1889. 



^ " Ulodtndron Taylori, Carruthers," Monthly Micros. Journ., Vol. III., 

 p. 152, PI. XLIII., fig. 1, 1870. 



