102 Arber — A Revision of the Seed Impressions of the 
(4) Rcidiospermum Kidstoni (Arber) (Plate II, Figs. 35, 36). 
Type Lagenostoma Kidstoni , Arber, ‘ Proc. Roy. Soc. London/ vol. B. 
76, p. 247, PI. I, Figs. 1-4 ; PI. II, Figs. 1-6. Recorded from the Lower 
Coal Measures of the Lanarkshire coalfield. 
Seeds small, elliptical, 6 mm. long, 2*5-3 mm * 
at greatest breadth. Testa smooth, slightly ridged 
longitudinally. Apex with several, up to six, well- 
marked lobes. No cupule. 
(5) ? Radio sper mum marginatum (Art.) (PI. VIII, 
Fig. 46). 
Type Carpolithus marginatus , Artis, ‘Antedil. 
PhytoL/ PI. XXII, B & C, 1825. Recorded from the 
Middle Coal Measures of the Wyre Forest and York- 
shire coalfields. 
Seed fairly large, ? radiospermic, subcircular, 
2-2*5 cm * across, with a very narrow marginal rim. 
Testa smooth, unornamented. 
(6) Radiospermum ornatum , sp. nova (PI. VII, Figs. 38-41). 
Types No. 1890, 1894, and 21 1 1, Carbon. Plant Coll., Sedgwick Museum, 
Camb. From the Middle Coal Measures, above the Top Hard Coal, Shipley 
Clay Pits, Derbyshire. 
Seed rather small, elongately triangular, tapered at both ends, rounded 
at one extremity, rather pointed at the other, 12-15 mm. long, each side of 
triangle about 5-6 mm. broad. Testa with twelve longitudinal ridges, three 
main ridges at the angles, and three minor, slightly less prominent ridges 
between each pair of major ridges. All ridges approximated at both 
extremities. Testa ornamented with conspicuous, approximated, transverse 
striations. 
(7) Radiospermum ovatum (L. and H.) (PI. VII, Fig. 32). 
Type Trigonocarpum ovatum , Lindley and Hutton, £ Foss. Flora/ vol. ii, 
PI. CXLIIa. Recorded from the Middle Coal Measures of Coalbrookdale 
and Yorkshire. 
Casts elongately ovoid, 4*5-6 cm. long and up to 3-5 cm. broad, rounded 
at one end, and slightly narrowed at the other, at which there is a foramen 
through which an inner cast may or may not project. Testa smooth, with 
three equidistant, blunt, longitudinal ridges. 
(8) Radiospermum perpusillum (Lesquereux) (PI. VII, Fig. 31). 
Type Carpolithes per pusillus, Lesquereux, ‘Coal Flora Pennsylv./ vol. iii, 
p. P. 825, PI. CXI, Figs. 22-24. Recorded from the Middle Coal Measures of 
the Midland, Pennine, and Welsh Borderland coalfields, and from the Lower 
Coal Measures of the Scottish coalfields. 
Seeds minute, cylindrical, about 3 mm. long. Testa smooth, with at least 
Text-fig. 8. Radio- 
spermum injlatam (Lesq.). 
After Lesquereux. 
