16 



Annals of the South African Museum. 



fern as Cladophlehis dcnticulata forma atherstonei. 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 Pecopteris indica 0. and M.f from the Eajmahal series of 

 Bengal, Asjjlenium argutuhim Heer, from China,:]: Fontaine's Clado- 

 phlehis oblongifolia from the Potomac formation, § Pteris frigida and 

 P. longipennis Heer,]] and Cladophlehis steioartiana Hartz *! are some 

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

 imder Cladophlebis 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. 



Cla(lo2>hlebis denticulata. . 



Pecojitcris indica 



Cladophlebis steicurtiania 



Pteris frigida 



P. alhertini 



CladojMehis oblongifolia. . 



Asplenium distans 



Asplenitnn argutulum .... 



Alethoj)teris australis 



Polijpodium hochstetteri .. 



Asph-iiiuni distans 



Cladophlebis dcnticulata . . 



Geographical range. 



England (E. Yorks) 

 India (Bengal) 

 Greenland 



Greenland 



Bohemia 



Eastern N. America 



Canada (Eocky 



Mountains) 

 China 

 Australia 

 New Zealand 

 Japan 

 Poland 



Approximate 

 geological horizon. 



Author. 



.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) 



Fric and Baver (01) 



Fontaine (89) 



Dawson (85) 



Schenk (83) 

 Feistmantel (90) 

 Unger (G4) 

 Yokoyama (89) 

 Raciborski (94) 



Plate VI., 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, 

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



t Oldham and Morris (62), pi. xxvii. 

 § Fontaine (89), pi. vii., figs. 8-5. 

 ^\ Hartz (90), pi. xi. 



