^{page 533 note *} Mem. of Geo. Survey, vol. iii. p. 291Google Scholar.

^{page 534 note *} Schimper and Zittel, Handb. der Palœontologie, Band ii. Lief i. p. 52.

^{page 536 note *} C. W. Peach on “Fossil Plants from the Calciferous Sandstone around Edinburgh,” Bot. Soc. Ed., vol. xiii.

^{page 536 note †} Mr. C. W. Peach has shown me young fronds of S. affinis in the circinate condition, exhibiting very beautifully the two forks rolled up in a crozier-like manner.

^{page 536 note ‡} Fos. Flora, vol. i. pl. liii.

^{page 536 note §} Stur., Culm-Flora, tab. xi. fig. 8.

^{page 537 note *} This is not so well shown in the small portions figured as in the larger specimens.

^{page 537 note †} Fos. Flora, vol. iii. pl. 214.

^{page 538 note *} Sphenopteris trifoliolata artis, s.p.

^{page 539 note *} Geo. Sur. of Illin., vol. iv.

^{page 539 note †} I differ from Mr. C. W. Peach in the identification of his Sph. affinis, and prefer calling the form which occurs on the slabs with staphylopteris Peachii, Sph. linearis. What I regard as Sph. affinis differs from S. linearis in having much smaller pinnules. It is most likely that these two ferns should form only one species, and, at the most, S. affinis be regarded as a variety of S. linearis.

^{page 539 note †} Coal Flora of Pennsyl. and U. S.

^{page 541 note *} Illustrations of Fossil Botany, Labour, G. A., pl. xxxvii., 1877Google Scholar.

^{page 545 note *} Atlas, Coal Flora of Pennsyl., pl. lxxxiii. figs. 6 and 6a.

^{page 545 note †} Fos. Flora der Permischen Formation, Göppert, 1865Google Scholar.

^{page 546 note *} Geo. of Illim., vol. iv., Lesq.; and Coal Flora of Pennsyl., Lesq., 1880.