ARBER : FOSSIL FLORA OF SOUTH YORKSHIRE COALFIELD. 153 
Scott, D. H., and Maslen, A. J. ('07). The Structure of the 
Palaeozoic Seeds, Trigonocarpus Parkinsoni, Brongniart, and 
Trigonocarpus Oliveri sp. nov., Part I., Ann. of Bot, Vol. XXI., 
p. 89, 1907. 
Vernon, R. D. ('09). The Geology of the Lower Coal Measures 
of the Derbyshire and Nottinghamshire portion of the York- 
shire coalfield. Geol Mag., Dec. 5, Vol. VI., p. 289, 1909. 
Wedd, C. B. ('03). In " Summary of Progress of Geol. Surv. for 
1902." Memoirs Geol. Surv., p. 13, 1903. 
EXPLANATION TO THE PLATES. 
((All the figures are from photographs by the Author (except 
Plate XVI., Fig. 1, by Mr. W. Tams) of specimens in the 
collection of Dr. Moysey, F.G.S., of Nottingham, unless the 
contrary is stated.) 
Plate XII. 
Fig. 1. — Palceostachya gracillima, Weiss, from the Middle Coal 
Measures of Brindsley Clay Pit (Horizon of Top Hard 
Coal), Kimberley, Nottinghamshire. Very slightly 
reduced. 
Plate XIII. 
Fig. 1. — Calamites sp. Cast of the external surface of a stem, from 
the Lower Coal Measures of Trowell Colliery, Notting- 
hamshire (Horizon of the Kilburn Coal) x f . 
Fig. 2. — Calamites sp. Reverse of Fig. 1, from the same 
locality x f . 
Fig. 3. — Calamites approximatus, Brongn., from the Middle Coal 
Measures of Newthorpe Clay Pit (No. 1), Notts. 
(Horizon between the Waterloo and the Ell Coals) 
f of natural size. 
Fig. 4. — Zeilleria avoldensis (Stur), from the Middle Coal Measures 
of Shipley Clay Pit, Derby. Horizon of the Top Hard 
Coal) X i. 
Plate XIV. 
Fig. Ij — Eremopteris 7noyseyi, n. sp., from the Middle Coal 
Measures of Digby Clay Pit, Kimberley, Notts. (Horizon 
of the Top Hard Coal) x f. 
