Mr Kidston on New or Little- Known Fossil Lyco'jiods. 417 



the lateral cicatricules. In some cases the central cicatricule 

 appears to be composed of two points placed closely together 

 (Fig. 3&). A form and arrangement of the vascular bundle 

 cicatricules such as that just described occurs only in the 

 genus Sigillaria. 



From the epidermal ornamentation of the cushions it is 

 also clear that the leaf was not attached to any part of its 

 surface, but to the vascular scar alone. 



This last character is of itself sufficient to exclude the 

 plant from Zejndodendron and restrict its relationship to 

 Lepido'jphloios or Siyillaria; but, as already indicated, the 

 vascular cicatricules are Sigillarian, and not those of Lepido- 

 2yhloios, and, in fact, there is here only a Clathrarian Sigillaria 

 with highly developed leaf- cushions. 



Of the three figures which I give of this plant. Figs. 3 and 

 5 must be regarded as representing the typical form. 



On all the specimens the leaf-scar is of the same shape, 

 but the slight sinus in its upper margin is sometimes very 

 feebly developed. 



In Fig. 3 the ornamentation is more strongly marked on 

 the portion of the leaf-cushion below the leaf-scar than on 

 the part above it; in Fig. 5 the ornamentation covers more 

 equally the whole surface of the cushion. 



In Fig. 4, on the other hand, the ornamentation is very 

 slightly represented ; so little is it shown that it can scarcely 

 be said to be present. Although on this specimen the leaf- 

 scars are larger and their cushions more elevated than in 

 Figs. 3 and 5 (see Fig. 4a), it probably represents a younger 

 state of the plant, which, when older, would have the cushions 

 more drawn out as in Fig. 5. 



As Figs. 3, 4, and 5 are drawn of the natural size, it is 

 scarcely necessary to give the measurements of the leaf-scars 

 and their cushions; these also vary considerably with the 

 age of the specimen. In all cases the leaf-scar is broader 

 than high. 



In the decorticated condition the surface of the stem is 

 roughened by an irregular small mesh-Hke granulation, 

 which is more or less arranged in vertical lines (Fig. 5, part 

 marked a). 



