54 Dr. W. C. Williamson on 



General, Morphological, and Histological Index to the 

 Author's Collective Memoirs on the Fossil Plants 

 of the Coal Measures. Part III. By William 

 Crawford Williamson, LL.D., F.R.S., &c, Foreign 

 Member of the Royal Swedish Academy ; Corres- 

 ponding Member of the Royal Society of Gottingen. 



{Received December 12 th, i8gj.) 



LIST OF WORKS 



ON THE ORGANISATION OF THE 



FOSSIL PLANTS OF THE COAL MEASURES, 



And General Index to their Contents. 



ROYAL SOCIETY SERIES, I. to XIX. 



Symbols. Parts. 



A. I. Calamites and suggested genus Calamopitus (not subsequently 



insisted upon). Figs. 16 and 17 do not belong to Calamites 

 but to the subsequently adopted genus Astromyelon. 

 Phil. Trans., 1871. 



B. II. Lepidodendron selaginoides, Diploxylon (Corda), Ulodendron, 



Favularia, Sigillaria, Stigmaria, Lepidodendroid Cone (?) 

 ultimately Lepidodendron parvulum. {Memoir XVI.) 

 Anabathra. Phil. Trans., 1872. 



C. III. Lepidodendron brevifolium, (Burntisland form) and its 



Lepidostrobus. Restoration of Lepidodendron. Phil. 

 Trans., 1872. 



D. IV. Lyginodendron Oldhamium ; Heterangium Grievii. Phil. 



Trans., 1873. 



E. V. Asterophyllites with Sphenophylloid axis. Sphenophyllum. 



Volkmannia (now Sphenophyllum) Dawsoni, Strobilus 

 of Asterophyllites (subsequently Paracalamostachys 

 Williamsoniana ; Weiss) Asterophyllites fruit (subsequently 

 Pabeostachya pedunculata. (See Weiss. Steinkohlen- 

 Calamarien). Calamostachys Binneyana, Calamites verti- 

 cillatus. Root of Asterophyllites (afterwards Amyelon). 

 Phil. Trans., 1874. 



F. VI. Rachiopteris aspera (afterwards petiole of Lyginodendron 



Oldhamium) Rachiopteris Oldhamium, Rachiopteris duplex, 

 Rachiopteris Lacattii, Rachiopteris bibractensis, Anacho- 

 ropteris Decaisnii. Phil. Trans., 1874. 



G. VII. Myelopteris (Medullosa of Cotta), Psaronius Renaultii, Kalo- 



xylon Hookeri (now known to be root of Lyginodendron). 

 Phil. Trans., 1876. 



