456 cash: fossil fructifications of Yorkshire coal measures. 
1880. Davis, J. W. & Lees, F. A. West Yorkshire, an account 
of its Geology, Physical GeogTaphy, Climatology, and 
Botany." London. 
1880. Zeiller, R. " Vegetaux fossiles du Terrain Houiller de 
la France," and Atlas. Paris. 
1880- 84. Lesqureux Leo. " Descriptions of the Coal Flora of the 
Carboniferous formation in Pennsylvania and through- 
out the United States, second Geological survey of 
Penn.sylvania. Report of Progress. P.," Harrisburgh, 
3 vols. 
1880. Williamson, W. C. " On Org. Fo,ss Plants of C. Meas." 
' Part 10/ Phil. Trans. Lond. 
1881. Williamson, W. C. Do. do. Part 11. 
Hick, Thos. and Cash, Wm. " Contributions to the Fossil 
Flora of Halifax, part HL" Yorkshire Geol. and 
Polytecli. Soc. 
1881. Sp?ncer, James. " The Fossil Flora of the Halifax Hard- 
Bed Coal." No. 1, March. Recreations in Fossil 
Botany No 2 April, No. 3 May, No. 4 June, No. 5 
August, No. 6 October, and No. 7 December. 
Hardwicke's Science Gossip, Lond. 
1881. Stur, D. " Zur Morphologic der Calamarien." Sitzberg 
d. K. Akad. d. Wissench. zu Wien. Math. Natur, 
Classe, Bd. 83„ Abth, 1, Heft, V, 
1881- 85. Renault, Bernard, " Cours de Botanique fossile," 
vols 1-4, Paris. 
1882. Spencer, James. " Astromyelon and its Affinities. Hard- 
wicke's Science Gossip." Sept. and Nov., 1882. 
London. 
1882. Sachs, Julius. Text Book of Botany," edited by S. H. 
Vines. 2nd edition. Clarendon Press, Oxford. 
1883. Spencer, James. " Recs. Foss. Botaiiy, No. 8, March, 
No. 9, May, and No. 10, July, 1883. Hardwicke's 
Science Gossip." London. 
1883. KiDSTON, Robert. " On the Affinities of the Genus Potho- 
cites, Paterson ; with the Description of a specimen 
