LIASSIO SYSTEM. 23 



conformable to the Ehsetic,' and thus it is not always a simple 

 matter to decide between Liassic and lihtetic as the most 

 appropriate designation for plants obtained from strata between 

 the uppermost Keuper and the lowest members of the true 

 Jurassic. For present purposes I have included under the term 

 Ehsetic the specimens obtained from the neighbourhood of Bristol, 

 confining the designation Liassic to the Dorsetshire and Yorkshire 

 plants. From a botanical point of view, there appear to be no 

 very obvious differences, as regards general composition, between 

 Rhsetic and Liassic floras. 



In 1824^ De la Beche published some Remarks on the Geology 

 of the South Coast of England,, from Briiport Harhour, Dorset, to 

 Balhacomhe Bay, Devon, accompanied by a coast-section of the 

 cHfEs from Bridport to Sidmouth. He speaks of blocks of fossil 

 ■wood from Lias limestones, and mentions the rare occurrence of 

 ' ferns ' in the rocks near Lyme ; two specimens are figured from 

 Buckland's collection, both of which are portions of Otozamites 

 fronds collected at Axminster in Dorsetshire. In a later volume 

 the same author published a fuller account of the Dorsetshire 

 coast-section ; in this memoir he figured a piece of knotted drift- 

 wood and a fragment of a plant which is, no doubt, Pagiophyllum 

 peregrinum. 



The following species of Lias plants are described in the Fossil 

 Flora of Lindley & Hutton : — ' 



Arauoaria peregrina, L. & H. = FagiopJiylliim peregrinmn (L. &H.). 



PI. Ixxxviii. 1833. Lyme Eegis. 



Stnbilites elongata, L. & H. Indeterminable. 



PI. Ixxxix. 1833. Lyme. 



Otopteris obtusa, L. & H. = Otozamites obtusus (L. & H.). 



PI. cxxviii. figs. 1-2. 1834. Mem- 

 bury, near Axminster, and Polden 

 Hill, near Bridgewater, Somerset- 

 shire. The type-specimen (fig. 1) is 

 in the Oxford Museum. 



Cycadeoidea pygmcea, L. & H. = Cycadeoidea pygmma, L. & H. 



PI. cxliii. 1835. Lyme. 



1 Woodward, H. B. (93), p. 22. 



2 De la Beche (24). 



■' Lindley & Hutton (31-37). 



