104 
WILLIAMSON : 
MEMOIRS AND PAPERS. 
Pt. XV. Phil. Trans. 1888, p. 155, seq. (deals with Zygopteris, 
Aiiachoropteris, and Rhachiopteris). 
Pt. xvi. Phil. Trans. 1889, p 193, seq. (deals with the development 
of the medulla in the centre of the axial vascular bundle, and 
with Rhachiopteris irregularis). 
Pt. xvii. Phil. Trans. 1890, p. 89, seq. (deals with Lyginodendron 
Oldhamium and Rhachiopteris aspera, Bowmanites, and Cala- 
mites). 
Pt xviii. Phil. Trans. 1891, p. 255, seq. (deals with Bowmanites 
Dawsoni and Rhachiopteris ramosa). 
Pt. xix. Phil. Trans 1892, p. 1, seq. (deals with Lepidodendron 
Harcourtii, Lepidophloios, Lepidodendron Spenceri, and Lepi- 
dostrobus). 
FURTHER OBSERVATIONS ON THE ORGANISATION OF THE FOSSIL PLANTS 
OF THE COAL MEASURES. 
BY ^y. C. WILLIAMSON, LL.D., F.R.S., EMERITUS PROFESSOR OF BOTANY IN 
THE OWENS COLLEGE, MANCHESTER, AND D. H. SCOTT, M.A., PH.D., 
HONORARY KEEPER OF THE JODRELL LABORATORY, 
ROYAL GARDENS, KEW. 
Phil. Trans, 1894, p. 868, seq. Pt. i. Calamites, Calamostachys, and 
Sphenophyllum. Pt. ii. The Roots of Calamites, 1894. Pt. 
iii. On Lyginodendron and Heterangium, 1895. 
MEMOIRS AND PAPERS BY W. C. WILLIAMSON, LL.D., F.R.S. 
A Notice of the locaHties, habits, characteristics, and synonyms of a 
rare British species of Mytikis. Mag. of Nat. Hist-, vol. vii., 
1834, pp. 133-135. 
On the Distribution of Organic Remains in the Lias Series of 
Yorkshire, with a view to facilitate its identification by giving 
the situation of the fossils. Proc. of Geol. Soc, vol. ii., 
1834, pp. 82-83. 
Description of the Tumulus lately opened at Gristhorpe, near Scar- 
borough, 1834. 
