

PRE-CARBONIFEROUS PLANTS. 



65 



obtained than that from the Hamilton Group (Middle Devonian), at 

 Eighteen Mile Creek on Lake Erie, originally submitted to me by Prof. 

 Hall. 



Syringoxylon Mirabile. 



Fig. 1. Transverse section, lOOdiametars, showing vessels, woods-cells and medullary rays. 



Fig. 2 and 3. Portions of the same, 300 diameters. 



Fig. 4. Longitudinal section of dotted duct, wood-cells and medullary rays, 300 diameters. 



Fig. 6. Wall of dotted duct, 600 diameters. 



Fig. C. Wood-cells and medullary rays, 600 diameters. 



IJNCEaTAiN Species. 



Megaphyton, sp. — J. G. S., XVIII. 



Acanthophyton spinosum, Dn. — J. G. S., XVIII. 



Cyclopteris incerta, Dn. — Ibid. 



Fern with netted veins, Dnj — J. G. S., XIX. 



Cyclopteris, sp., Dn. — Ibid. 



Selaginites formosus, Dn.— Can. Nat., VI; J. G. S., XVIII, 316. 



The first five of the above are forms still too uncertain to be classified. 

 The last I desire to abandon as a vegetable species. It was founded on 

 specimens obtained at Gasp^, which seemed to me to represent scaly 

 stems or branches. The late Mr. Salter suggested that they might be 

 fragments of some Eurypteroid crustacean. At the time I thought that 

 the shape of the specimens precluded this supposition, but a number of 

 additional fragments since obtained, have convinced me that Mr. Salter 



