part 3] 



FOSSIL PLANTS FROM THE FALKLAND ISLANDS. 



329 



well preserved to be assigned on adequate grounds to previously- 

 recorded species, indicate a Devonian age, and, compared with 

 European standards, probably a Middle rather than an Upper 

 Devonian horizon. 



Seward & Walton. 

 Lepidodendroid stems. Port Purvis. 



Halle. 



Lepidodendroid fragments. Halfway 

 Cove. 



' Indeterminable stem-fragments.' Half- 

 way Cove. These we compare with 

 TPornea Lignieri Kidston & Lang. 



' Unknown plant-fragments.' Compared 

 by us with branched axes from the 

 Lower Old Red Sandstone of Caith- 

 ness, figured by Salter as rootlets. 



II. Permo- Carboniferous plants. — The following list 

 includes all the plants so far discovered. We have appended to 

 some of Halle's determinations a few critical remarks : — 



Equisetaceous stems. — I. Cf. Phyllo- 

 tlieca australis Brongniarfc and P. de- 

 liqnescens (Goeppert). Speedwell Is- 

 land ; George Island ; North Arm 

 (Bay of Harbours) ; Dos Lomas. 



Equisetaceous stems. — II. Cf. Neocala- 

 mites Carver ei (Zeiller). Cygnet Har- 

 bour; Egg Harbour. 



■Glossopteris indica Schimper. Speed- 

 well Island; George Island; North 

 Arm (Bay of Harbours) ; Dos Lomas ; 

 Goose Green. Glossopteris indica 

 Schimper cf. var. Wilsoni Seward. 

 Glossopteris indica Schimper, cf. G. 

 decipiens. North Arm (Bay of Har- 

 bours). 



'Glossopteris Browniana Brongniart. 

 George Island ; North Arm ; Goose 

 Green. 



Dadoxylon Bakeri, sp. now 

 Creek and Fanny Cove. 



Walker 



Phyllotheca australis and cf. P. deli- 

 quescens. We are unable to distin- 

 guish some of the specimens from the 

 Southern Hemisphere described as P. 

 australis from P. deliquescens. 



Not recorded by Halle. 



Glossopteris indica and G. angustifolia. 

 We see no sufficient reason for separ- 

 ating specifically the leaves so named. 



Glossopteris Browniana and Gangamo- 



pteris cyclopteroides var. major. 

 Glossopteris damudica Feistmantel. 



Coniferous twigs ; cf. Voltzia lietero- 



phylla Brongniart. 

 DesniiopJiyllum sp. 



Dadoxylon lafoniense. 



Dadoxylon cf. D. angustum Felix. The 



woods so named are both closely 



allied to D. Bakeri. 



The Permo-Carboniferous plants do not afford any clear indi- 

 cation of a sequence in time of the rocks at the several localities 

 where specimens have been obtained. The Equisetaceous stems 

 compared with Neocalamites Carrerei are from Cygnet Harbour 

 and Egg Harbour and, if our comparison is based on a real 

 affinity, this suggests that the beds at these places may he homo- 

 taxial with Triassic strata. The other Equisetaceous stems and 

 the two species of Glossopteris (G. indica and G. Browniana) have 

 not onlv a wide geographical range, but occur in more than one 



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