400 Linnarsson — On the Eophyton Sandstone. 



Fig 4 in the same plate represents a specimen, somewliat wea- 

 thered, the outlines of which are therefore not quite distinct. Its 

 visible breadth is about 15 millimetres. In the upper part a branch 

 or a leaf (?) runs out, the base of which forms a ridge obliquely 

 crossing the whole breadth of the stem. Its free portion is bent 

 almost straight upwards, parallel to the stem, but broken so near 

 the base, that its form cannot be conjectured. The longitudiual 

 furrows of the stem are close and narrow, but in consequence 

 of the weathering, not very distinct. In the lower portion they 

 are gently and irregularly bent, then straight, until immediately 

 beneath the oblique ridge they are suddenly bent in the same direc- 

 tion as the ridge ; above this they are quite straight. In the ap- 

 pendicular organ no furrows are visible, but that, perhaps, depends 

 partly on the matrix being there more coarse-grained. This speci- 

 men agrees in many respects with the right-hand one in Fig. 3, and 

 in order that the conformity between the two in the course of the 

 furrows may be more conspicuous, it has been drawn inverted in 

 Fig. 4a by the side of its presumed analogue in Fig. 3. At d in 

 Fig. 4a as at A in Fig. 3 the ribs to the left bend outwards, and 

 close above this point there are no furrows in either specimen, 

 and when these reappear in the upper part they are straight, 

 the right-hand furrows not partaking of the flexion, but running 

 without interruption. — Though probably not belonging to this fossil, 

 a small conical tubercle (a in Fig. 4), seems worthy of attention, 

 arising, as it does, in the very margin of the stem, and being sur- 

 rounded by an annular eminence. 



Plate XII. represents a slab which evidently has been long ex- 

 posed to the air, so that in some places the sculpture is not so con- 

 spicuous as in that just described. It contains several larger and 

 smaller fragments of stems. They are all distinguished from the 

 foregoing by their inferior breadth, which is from four to six milli- 

 metres. The furrows are in all somewhat conformable and narrow, 

 though for the most part larger than those in the first-mentioned speci- 

 men. Some of the stems are depressed, but in some of them the height 

 above the surface of the slab is nearly as great as the breadth ; the 

 more convex ones are often angular. The largest specimen has a 

 length of about 100 millimetres. It is divided into two branches of 

 equal size, making an angle of about 40°, and having the same 

 breadth as the common stem. The left branch seems to be some- 

 what tapering, but that depends no doubt on its gradually sinking 

 in the matrix. Between the branches lies a fragment (a) the extre- 

 mities of which seem to be abruptly cut off at their contact with 

 them. In the axilla of the branches an oblong, irregular, convex 

 mass (Z*) runs out, which, however, shows no trace of structure. 

 The common stem is slightly bent, and has its hinder part sunk 

 in the matrix ; but in its continuation there lies a very convex 

 fragment (c) of similar form. From beneath the anterior part of 

 this another depressed fragment {d) projects with more obscure 

 outlines. Whether they are coherent or not cannot be seen, a form- 

 less mass covering the point at which they meet. — Among the other 



