Fossil plants, Vol. 1: [A text-book] for students of botany and geology

by A. C. Seward

[165] Challenger (85) p. 934.

[166] Ehrenberg (36) p. 117, Pl. I. figs. 1 and 4, and Ehrenberg (54) Pl. XXXVII. fig. vii.

[167] Schütt (96) p. 22.

[168] Bütschli (83–87) p. 1028.

[169] Challenger Reports (85) p. 939.

[170] Challenger Reports (91) p. 257.

[171] Hensen (92), Schütt (93) p. 44.

[172] Murray, G., and Blackman, V. H. (97).

[173] Dixon and Joly (97).

[174] Sorby (79) p. 78.