64 MATONIDIUM. 
1871. Matonidium Gépperti, Schenk, Paleontographica, vol. xix. p. 219, 
pl. xxvii. figs. 5 and 5a; pl. xxviii. figs. 1 and 2; pl. xxx. fig. 3. 
1874. Matonidium Gopperti, Schimper, loc. cit. vol. iii. p. 507. 
1875. Matonidium Gépperti, Schenk, Paleontographica, vol. xxiii. p. 160, 
pl. xxvii. fig. 9. 
1875. Pecopteris polydactyla, Phillips, Geol. Yorks. p. 207. 
? Pecopteris eespitosa, Phillips, loc. cit. p. 207, fig. 20; pl. viii. 
fig. 10. 
1878. Alethopteris elegans, Dupont, Bull. Ac. Roy. Belg. vol. xlvi. sér. ii. 
p. 396. 
Preopteris Conybeari, Dupont, loc. cit. p. 396. 
1881. Matonidium Gépperti, Heer, Secc. Trab. Geol. Portugal, p. 16, 
pl. xv. figs. 1-6. 
1883. Matonidium Gopperti, Renault, Cours bot. foss. vol. iii. p. 76. 
1888. Matonidium Gopperti, Schulze, Flor. subhercyn. Kreid. p. 11. 
Type. Large specimens of sterile and fertile segments. In the 
Berlin Collection. 
The material in the British Museum is very much less perfect 
and more scanty than that at the disposal of Schenk; we may, 
therefore, quote his definition verbatim : ? 
‘‘Folia petiolata flabellato-pinnata, segmenta brevite petiolata 
pinnatifida, in foliis junioribus 5—6, in adultioribus usque quatuor- 
decim, ambitu linearia basi et apice attenuata acuminata, adulta 
25 centim. longa, laciniz patentissime alterne vel subopposite 
integre, inferiora abbreviate rotundate, medium versus sensim 
~longiores, mediz oblongo-lanceolate, summe breviores ovate, 
nervi primarii excurrentes, secundarii angulo subrecto egredientes 
dichotomi, ramuli simplices, sori biseriales oblongi indusiati, 
sporangia in ramulo affixa, annulus obliquus.”’ 
Dunker’s figures of this species represent sterile portions of leaf 
segments; the differences in size led him to separate them as 
distinct species. 
I have decided to follow Leckenby’s example* with regard to 
the reference of the specimens from the Yorkshire Oolite to the 
present species. A comparison of his figure, pl. ix. fig. la, and 
Schenk’s pl. xxvii. fig. 9, Paleeontographica xxiii. leaves little 
doubt as to the specific identity of the two plants. Another 
Jurassic species, Pecopteris cespitosa, Phillips, appears to me 
inseparable from Matonidium Gépperti; compare especially wood- 
1 Paleontographica, vol. xix. p. 220. 
2 Quart. Journ. Geol. Soc, vol. xx. 1864, p. 80. ¥ 
