798 MR ROBERT KIDSTON ON THE FOSSIL PLANTS OF 



wise difficult to understand ; and as pointing to this being the correct explanation, the 

 upper shield is only present on the part shown at fig. 18a. The vascular impression is 

 therefore not clearly seen on any of the specimens yet discovered. 



The occurrence of the genus at Canonbie is an interesting addition to the British 

 Palaeozoic flora. 



Pinakodendron Macconochiei, Kidston, n.sp. 

 (Plate I. figs. 9-11.) 



Description. — Leaf scars distant, upright-oval, very small, about 2 mm. high and 1"50 

 mm. broad. Cortex ornamented with a very fine irregular meshwork formed of little 

 ridges. Vascular cicatricules not visible. 



Remarks. — The only specimen discovered is shown natural size on PL I. fig. 10, and 

 a portion enlarged three times at fig. 9. A still further enlarged sketch of the orna- 

 mentation of the outer surface of the bark is given at fig. 11. The surface ornamen- 

 tation becomes very fine immediately above and below the leaf scars. 



Pinakodendron Macconochiei differs from both the species described by Weiss in 

 the much more irrgular meshwork ornamentation of the cortex, and is further dis- 

 tinguished from Pinakodendron musivurn, Weiss, by the absence of the surrounding 

 elevated rim of the little semi-pit-like structure in which the leaf scar is placed, and 

 from Pinakodendron Ohmanni, Weiss, by its oval leaf scar. 

 Locality D. 



Stagmaria, Brongniart. 



Stagmaria ficoides, Sternberg, sp. 



Stagmaria ficoides, Sternb., sp. Ante, p. 757. 



Locality D. — The ordinary form and another with closer and slightly small scars 

 were collected. 



Sphenophyllacese. 



Sphenophyllum, Brongniart. 



Sphenophyllum cuneifolium, Sternb., sp. Ante, p. 778. 



Locality C. — Sphenophyllum cuneifolium and var. saxifragsefolium, were met with 

 here. 



Locality D. — Only Sphenophyllum cuneifolium was collected at this locality. 



