712 DR R. KIDSTON. 



the length of the cushion which separates them are shown on PI. II, figs. 1 4, and 

 PI. Ill, figs. 4 and 8. These specimens are preserved in the Collection of the 

 Geological Survey of Scotland, Edinburgh. 



Near the top of the specimen given on PI. II, fig. 1, are seen some cone scars, in 

 the neighbourhood of which the leaf scars are much compressed, being broader than 

 long, and occupy the whole of the cushion except a small portion at both sides 

 (fig. la). The upper and lower margins are straight or even slightly hollowed in 

 some cases, while others have on the basal margin a prominent central little point. 

 On the lower part of the specimen, the leaf scars assume the normal form of Sigillaria 

 elegans (fig. l), some of which are emarginate on their upper margin and rounded at 

 the base, below which is only a very narrow band of smooth cushion. 



Fig. 2 shows portion of a specimen on whose upper part are some normal leaf 

 scars, but immediately below them the cushions and leaf scars begin to elongate, the 

 lower margin of the latter ending in somewhat sharp points. The cushion below the 

 leaf scar is smooth. A piece of the counterpart is given at fig. 3. In both the 

 cushions are clearly delimited by a straight furrow, and from some of the leaf scars a 

 decurrent line descends from the lateral angles, which, bending slightly inward, runs 

 parallel with the margin of the cushion. In fig. 4, PI. II, the smooth leaf cushions 

 are not quite so much developed as in the last example. The leaf scars, which in all 

 cases are situated at the upper end of the cushions, have emarginate upper margins 

 and generally end in a point at the base. The lateral angles are prominent. These 

 characters can be clearly seen on the figures, which should be examined with a lens. 



Another small fragment is given on PL III, fig. 4, enlarged two times. On the 

 upper part of the fossil, in the neighbourhood of a branch whorl, the leaf scars are 

 much transversely elongated and partially deformed through mutual pressure. At 

 the bottom of the figure they assume the usual characters of Sigillaria elegans. The 

 leaf scar is emarginate at the top and has sometimes a sharp point at the base, the 

 lateral angles are well developed ; the leaf scar occupies the whole width of the 

 cushion, except at the margins, where there is a narrow border of cortex. 



This specimen is identical with the Sigillaria micr07'hombea^ as figured by Koehne,* 

 and very similar to Sigillaria microrhombea, var. acutissima Weiss, t only the leaf 

 scars are not quite so sharp-pointed laterally as in Weiss' figure. With Sigillaria 

 elegans Sternb., sp., must also be united the Sigillaria squamata Weiss4 There 

 appear to be no fixed characters whereby these "species" can be separated from 

 Sigillaria elegans Sternb. and Brongt. or from Sigillaria elegantula Weiss. 



All the specimens described above occurred together. 



Another small specimen of Sigillaria elegans Sternb., sp., is given on PI. Ill, fig. 8, 

 natural size, and a part is enlarged two times at fig. 8a. Here the relative proportion 

 of cushion to leaf scar varies considerably. At the upper end of the specimen, seen 

 more clearly on the enlargement fig. 8a, the leaf scars are those of Sigillaria elegans, 



* I.e., No. 53, fig. 3. f I.e., p. 17, pi. (1) vii, fig. 2. % I.e., p. 25, pi. (2) viii, figs. 17-22. 



