Mancliester Memoirs, Vol. li. (1907), No. Ill 



XIII. On a confusion of two species {Lepidodendron Har- 

 courtii, Witham, and L. Hickii, sp. nov.) under 

 Lepidodendron Harcourtii, Witham, in Williamson's 

 XIX. Memoir; with a description of L. Hickii, 

 sp. nov. 



By D. M. S. Watson. 



Received and read January 2gth, igoy. 



Introductory. 



In the XlXth and last of his fine series of Memoirs 

 " On the Organisation of the Fossil Plants of the Coal 

 Measures" (Williamson, '93), Williamson described several 

 specimens as Lepidodendron Harcourtii, Witham, which 

 were interesting as showing leaf bases and halonial 

 branching. My attention was drawn to this description 

 by the examination of sections from Hough Hill in the 

 Manchester Museum, and in my own collections. 



I was soon convinced of the identity of my sections 

 with those figured by Williamson, and at the same time 

 my suspicion that they were not L. Harcourtii, Witham, 

 was strengthened by the receipt of a section of a true 

 L. Harcourtii (Witham) still retaining its leaf bases. 



Subsequent examination of the sections leads me to 

 regard the species as distinct from all yet described, and 

 I dedicate it to the memory of the late Thomas Hick, of 

 Manchester and Halifax, as Lepidodendron Hickii. 



Analysis of Williamson's XIX. Memoir. 



Williamson starts his paper with an account of 

 previous work on L. Harcourtii, Witham. 



June is tii, 1 go/. 



