64 MATONIDITTM:. 



1871. Matonidium Gopperti, Schenk, Paloeontographica, vol. xix. p. 219, 

 pi. xxvii. figs. 5 and 5a; pi. xxviii. figs. 1 and 2 ; pi. xxx. fig. 3. 



1874. Matonidium Gopperti, Schimper, loc. cit. vol. iii. p. 507. 



1875. Matonidium Gopperti, Schenk, Palaeontographica, vol. xxiii. p. 160, 



pi. xxvii. fig. 9. 

 1875. Pecopteris polydactyla, Phillips, Geol. Yorks. p. 207. 



? fecopteris ccespitosa, Phillips, loc, cit. p. 207, fig. 20; pi. viii. 



fig. 10. 

 1878. Akthopteris elegans, Dupont, Bull. Ac. Roy. Belg. vol. xlvi. ser. ii. 



p. 396. 



Ptcopteris Conybeari, Dupont, loc. cit. p. 396. 

 1881. Matonidium Gopperti, Heer, Secc. Trab. Geol. Portugal, p. 16, 



pi. xv. figs. 1-6. 



1883. Matonidium Gopperti, Renault, Cours hot. 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 : J 



" 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, laciniee patentissimse alternse vel suboppositae 

 integrae, inferiora abbreviates rotundatae, medium versus sensiui 

 longiores, mediaa oblongo-lanceolatae, summa9 breviores ovatae, 

 nervi primarii excurrentes, secundarii angulo subrecto egredientes 

 dichotomi, ramuli simplices, sori biseriales oblongi indusiati, 

 sporangia in ramulo affixa, annulus obliquus." 



Bunker'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 2 with regard to 

 the reference of the specimens from the Yorkshire Oolite to the 

 present species. A comparison of his figure, pi. ix. fig. la, and 

 Schenk's pi. xxvii. fig. 9, Pala3ontographica xxiii. leaves little 

 doubt as to the specific identity of the two plants. Another 

 Jurassic species, Pecopteris ceespitosa, Phillips, appears to me 

 inseparable from Matonidium Gopperti', compare especially wood- 



1 Palseontographica, vol. xix. p. 220. 



2 Quart. Journ. Geol. Soc. vol. xx. 1864, p. 80. 



