1863.] DAWSON DEVONIAN PLANTS. 467 



v 3. Nematoxylon tentje, spec. nov. PI. XVIII. fig. 23. 



Slender stems with thick coaly bark, and woody fibres of much smaller 

 diameter than in the last species, and marked with minute dots. 



The stems of this species are small, not exceeding half an inch in 

 diameter, bnt are distinctly surrounded by a thick, shining, coaly bark. 

 The wood is calcified, and appears to be perfectly homogeneous, and 

 composed of the tissue represented in PL XVIII. figs. 23 a to 23 c, the 

 last two of which are drawn to the same scale as fig. 246, to show 

 the different dimensions of the cells. It may be doubted if this 

 species has any real affinity with the last, but they correspond in their 

 negative characters, and both appear to indicate the existence of cer- 

 tain woody Plants of singularly simple and homogeneous structure. 

 Many of the small carbonized fragments scattered over the surfaces 

 of the Gaspe sandstones belong to the present species, and were no- 

 ticed in my former paper on the Plants of Gaspe as aporous tissues 

 of uncertain nature. 



/\ 4. Incert^: sedis. 



Among Mr. Bell's specimens are many fragments of quite uncer- 

 tain character. One of these is a stem thickly studded with minute 

 irregularly placed points or tubercles, and having a finely striated 

 surface (PI. XIX. fig. 25). It resembles the "branching root" figured 

 by Mr. Salter from the Devonian of Stromness. Another is a stem 

 with interrupted ridges, in the manner of Ehachiopteris striata from 

 the Devonian of New York, fig. 31. It may be the stipe of a Pern. 

 Another (fig. 29) is a very slender stem marked with minute raised 

 scales or rudimentary leaves, and possibly a Lycopodites of the type 

 of L. Milleri, Salter. To these I have added, from my own collection, a 

 little Stigmarioid Plant, fig. 31, which, if really a Stigmaria, is the 

 most diminutive of the genus ; but it may admit of doubt whether 

 it is not an imperfectly preserved Lepidodendroid Plant. 



5. Alg2e. PL XIX. figs. 32 & 33. 



In Mr. Bell's collection are numerous specimens, apparently of 

 Sea-weeds, resembling the Cauda- galli Fucoid of the Devonian rocks 

 of New York. They appear to include two distinct forms. One of 

 these (fig. 32) consists of cylindrical and dichotomous filaments, and 

 may be referred to the provisional genus Chondrites. It appears to 

 be the first or fibrous form of Fucoides Cauda-galli mentioned 

 by Vanuxem (Report, p. 128, fig. 30). The other (fig. 33) is a con- 

 tinuous frond, and shows indications of having been thickened or 

 folded at the convex margin. It might be placed in the genus Zo- 

 narites, and is probably identical with Vanuxem's second or conti- 

 nuous form, for which he proposes the name Fucoides velum. Both 

 occasionally appear as if looped or attached at both extremities, as 

 was the case in Vanuxem's specimens. The first-mentioned species, 

 or variety, is found in beds believed to be Upper Silurian, and which 

 contain obscure remains of Land-plants, at Aune a la Barbe in the 



