British Coal Measures. 105 
Lindley, J., and Hutton, W. (’31) : The Fossil Flora of Great Britain. Vols. i-iii, London, 
1831-7. 
Morris, J. (’40) : In Prestwich, On the Geology of the Coalfield of Coalbrook Dale. Trans. Geol. 
Soc., Ser. 2, vol. v, 1840, p. 488. 
Oliver, F. W. (’03): The Ovules of the Older Gymnosperms. Ann. Bot., vol. xvii, 1903, p. 451. 
Oliver, F. W., and Salisbury, E. J. (’ll) : On the Structure and Affinities of the Palaeozoic 
Seeds of the Conostoma Group. Ann. Bot., vol. xxv, 1911, p. 1. 
Renault, B. (’90) : Etudes sur le terrain houiller de Commentry. Livr. ii, Flore Fossile, 2 e partie, 
Saint-fetienne, 1890. 
Scott, D. H., and Maslen, A. J. (’07) : The Structure of the Palaeozoic Seeds, Trigonocarpus 
Parkinsoni , Brongniart, and Trigonocarpus Oliveri , sp. nova. Part I. Ann. Bot., 
vol. xxi, 1907, p. 89. 
Sternberg, K. (’20) : Versuch einer geognostisch-botanischen Darstellung der Flora der Vorwelt. 
Leipzig und Prag, 1820-38. 
Weiss, C. E. (79) : Beitrage zur fossilen Flora. II. Die Flora des Rothliegenden von Wiin- 
schendorf bei Lauban in Schlesien. Abhandl. Geol. Specialk. Preuss., Thiir. Staat., vol. iii, 
pt. i, 1879. 
Woodward, J. (1729) : An Attempt towards a Natural History of the Fossils of England, &c. 
Tome II : A Catalogue of the Additional English Native Fossils, &c. London, 1729. 
Zeiller, R. (’86) : Flore fossile du bassin houiller de Valenciennes. (Etud. Gites Miner.) Paris, 
1886-8. 
(’02) : Flore fossile du bassin houiller et permien du Brive. (Etud. Gites Min&r.) 
Paris, 1892. 
— (’00) : Elements de paleobotanique. Paris, 1900. 
EXPLANATION OF THE PLATES 
Illustrating Dr. Newell Arber’s Revision of the Seed Impressions of the British Coal Measures. 
(The photographs are partly by the author, partly by Mr. Tams, Cambridge.) 
PLATE VI. 
~ Fig. 1. Trigonocarpus Moyseyi, sp. nova, forma a. An almost complete impression of the 
external surface of the seed. From the Middle Coal Measures of Shipley Clay Pit, Derby. The 
type specimen in Dr. Moysey’s collection, x f. 
- Fig. 2. Trigonocarpus Parkinsoni , Brongn., forma /3. Impression of the sclerotesta and 
micropyle. From the Middle Coal Measures of Yorkshire. Sedgwick Museum, Cambridge 
(No. 1184, Carbon. Plant Coll.). Nat. size. 
Fig. 3. Trigonocarpus Parkinsoni , Brongniart, forma 7. Tri-ridged casts of the inner surface 
of the sclerotesta. From the Middle Coal Measures of Peel Quarry, Bolton, Lane. Sedgwick 
Museum, Cambridge (No. 485, Carbon. Plant Coll.). Nat. size. 
Fig. 4. Ti'igonocarpus Parkinsoni, Brongniart, forma 7. The bases of two specimens seen 
from above. That of the lower specimen is smooth, that of the upper shows an oval umbilicus. 
From the Middle Coal Measures of Peel Quarry, Bolton. Sedgwick Museum, Cambridge (No. 485, 
Carbon. Plant Coll.). Nat. size. 
Fig. 5. Trigonocarpus Parkinsoni, Brongniart, forma 7. The bases of two further specimens, 
both showing an umbilicus. From the Middle Coal Measures of Peel Quarry, Bolton. Sedgwick 
Museum, Cambridge (No. 485, Carbon. Plant Coll.). Nat. size. 
Fig. 6. Trigonocarpus Parkinsoni , Brongn. A petrified example described by Mrs. E. A. N. 
Arber on p. 195. Median longitudinal'section through the seed, showing the micropylar beak of the 
sclerotesta with great completeness. Binney Coll., Sedgwick Museum, Cambridge, Slide A.B. 11. 
X 2*5 circa. 
Fig. 7. Trigonocarpus Parkinsoni, Brongn. A petrified example described by Mrs. E. A. N. 
