Mr Kidston on New or Little-Known Fossil Lycopods. 421 



This example agrees in all respects with the figure given by 

 Sauveur (without description), and that described by Boulay, 

 except that neither of these authors notes the occurrence of 

 the transverse furrow above the leaf-scar ; but the specimens 

 examined by these writers do not appear to have been very 

 well preserved. 



Boulay mentions, in his description, that in his fossil the 

 cicatricules were badly preserved ; and from the slight hazi- 

 ness which pervades Sauveur's figure, one is also led to con- 

 clude that neither was it in a very good state of preservation. 



The ribs on the Scotch specimen are broader in proportion 

 to the size of the leaf-scars than in the foreign examples ; but 

 this character is evidently dependent on the age of the plant. 



I have observed in specimens of SigiUaria Icevigata, 

 Brongniart, that, though the ribs with age increase much 

 in width, the leaf-scars undergo little or no enlargement ; 

 hence the relative size of the leaf-sear to the width of the 

 rib appears to be of very little specific value. The distance 

 of the leaf-scars apart is also subject to much variation, even 

 on the same specimen. 



SigiUaria Walchii appears to be rare in Britain. The 

 only example I have as yet seen was communicated to me 

 for examination by Mr J. Smith, Kilwinning, to whose 

 courtesy I am indebted for the addition of this species to 

 our Carboniferous fossil flora. 



Horizon, Coal-measures ; roof of turf-coal. 



Locality, Kilwinning, Ayrshire. 



4. Lepidodeiidron FeacJiii, Kidston, n. sp. (PL XXI., Fig. 6). 



Description. — Leaf-scars rhomboidal, the boundary lines of 

 the upper part of the leaf-scar convex, those of the lower part 

 concave, lateral angles prominent. Vascular impression 

 slightly above the middle, rhomboidal, transversely elongated; 

 from its lateral angles extends a raised line to the centre of 

 the lateral angles of the leaf-scar, dividing the " field " into 

 an upper and a lower portion. The upper part of the leaf-scar 

 is slightly more elevated than the lower portion, which causes 

 it to rise above the vascular impression in a hood-like manner. 

 Vascular-bundle cicatricules three, punctiform. 



