16 



Annals of the South African Museum. 



iern as Cladophlchis denticulata forma atlierstonci. The epithet 

 denticulata may in some instances prove misleading, but the presence 

 or absence of fine denticulations is in itself hardly a character of 

 primary taxonomic value. Moreover, in imperfectly preserved 

 specimens so small a point is not easy to determine. The figures 

 ■of English East Yorkshire specimens * of Brongniart's type bear a 

 very close resemblance to the fragments of the South African plant ; 

 similarly Fecopteris indica O. and M.f from the Eajmahal series of 

 Bengal, Aspleniu7n argutidum Heer, from China, | Fontaine's Clado- 

 phlebis ohlongifolia from the Potomac formation, § Pteris frigida and 

 P. longipennis Heer,|l and Cladojjhlebis steivat'tiana Hsurtz^ are some 

 of the many examples of fern fronds that might well be grouped 

 under Cladophlchis denticulata. 



The following list serves to illustrate the geological and geographical 

 range of ferns comparable with, and no doubt in part identical with, 

 Brongniart's Inferior Oolite type. The references to authors are 

 given in full in the Bibliography. 



Names employed by 

 Authors quoted. 



Geographical range. 



Approximate 

 geological horizon. 



Cladopldehis (lenticulata. . 



Pecopteris indica 



CladopJilehis steivartiania 



Pteris frigida 



P. alhertini 



Cladophlebis ohlongifolia. . 



Aspleiiivm distans 



Asplenium argutidum 



AJetJwpteris australis ... . 



Polypodium liochstetteri . . 

 AsiAenium distans 



Cladophlebis denticulata . . 



England (E. Yorks) 

 India (Bengal) 

 Greenland 



Greenland 



Bohemia 



Eastern N. America 



Canada (Eocky 



Mountains) 

 China 

 Aiistralia 

 New Zealand 

 Japan 

 Poland 



Jurassic 

 Jurassic 

 Jurassic 



Lower Cretaceous 

 Lower Cretaceous 

 Wealden — Upper 



Jurassic 

 Lower Cretaceous 



Jurassic 

 Jurassic 

 Wealden? 



Jurassic 

 Jurassic 



Seward (00) (00=-) 



Oldham & Morris (63) 



Feistmantel (77) 



Hartz (96) 



Heer (82) 



Erie and Bayer (01) 



Fontaine (89) 



Dawson (85) 



Schenk (83) 

 Feistmantel (90) 

 Unger (64) 

 Yokoyama (89) 

 Eaciborski (94) 



Plate YI., figs. 16, 17 (170d). 



The specimen shown in fig. 16 is one of several fragments of 

 pinnae bearing linear pinnules approximately 3 cm. in length. The 

 distal portion of the pinnule represented in fig. 17 illustrates the 

 form of the apex which is not seen in fig. 16. The Herbertsdale 



Seward (00), pi. xiv., xv., xx. 

 Schenk (83), pi. xlvi.-xlviii., lii. 

 Heer (82), pi. x.-xiii. 



t Oldham and Morris (62), pi. xxvii 

 § Fontaine (89), pi. vii., figs. 3-5. 

 H Hartz (96), pi. xi. 



