o/'lllodendron to Lepidodendron, cfcc. 167 



cumbent on the surface of the stem, and hides beneath it 

 the impressions of the ordinary leaf-scars. 



As these ridges are often more a bending over to one side 

 than a flattening out of the ridge, probably the surface they now 

 present represents the original depth of the clefts in the bark ; 

 if this view is correct, in this case they cannot have been much 

 less than an inch deep. The form of the leaf-scars is broadly 

 fusiform, and they agree well in character with those of 

 Sagenaria [Lepidodeiidron) acuminata, Goppert*. 



Specimen No. 9. From same locality as No. 8. — On another 

 impression, which is about 6 inches high and 10 inches 

 broad, the flattening of the casts of the clefts in the bark is 

 carried to a greater extent than in the last specimen. Over a 

 space of about 5^ inches, the whole of the leaf-scars are 

 obliterated by the flattening of what appear to have been 7 

 ridges (the casts of what were originally 7 clefts in the bark). 

 This is succeeded by a vertical band of about 1 inch wide, on 

 which the impressions of the leaves are shown ; succeeding 

 this there is another ridge about yo of an inch wide, then 

 another vertical band exhibiting the leaf-scars 1^ inch wide, 

 then another flattened ridge fully an inch wide. Impressions 

 of Lepidodendron Veltheiniianum , on which the leaf-scars are 

 quite obliterated by these flattened ridges, have been handed 

 to me several times as Sigillarian stems. 



Specimen No. 10. Lepidodendron [Veltheimianum ?). From 

 Grange Colliery, Bo'ness, Linlithgowshire (Carboniferous 

 Limestone Series). Collected by H. M. Cadell, Esq. — This 

 specimen occurred along with numerous examples of Lepido- 

 dendron Veltheimianum ; but as none of the leaf-scars are seen 

 on the fossil, it would be unsafe positively to refer it to that 

 species. It represents the impression of a fragment of a very old 

 stem, from which all traces of the leaf-scars have been oblite- 

 rated by longitudinal furrows ; these have rounded surfaces, 

 and do not run continuously for any great length, but as soon 

 as one ceases, another originates to take its place. It appears 

 to have been a similar condition of an old Lepidodendroid 

 stem that has given rise to the Lyginodendron Landshurgii, 

 Gourlie f. A somewhat similar state of an old stem oi Lepido- 

 dendron has been figured by Sir William Dawson|. Probably 

 the Bo'ness example only represents a further stage of the 



* Foss. Flora d. Uebergangsgebirges, pi, xxiii. fig. 4, and pl.xliii. fig. 8. 



t Proceed, of Phil. Soc. of Glasgow, vol. i. pt. ii. p. 108 (1841-44), I 

 am doubtful if the plant whose curious structure has been so fully ex- 

 plained by Dr. Williamson as Lyyinodendron Oldhamii has any con- 

 nexion with the genus Lyginodendron of Gourlie. 



J Acadian Geol. 2nd ed. p. 445, fig. 170 c (1868). 



