258 Mr. E. Kidston on the Relationship 



names of Ulodendron minus and Lepidodendron Velthei- 

 mianum. 



It is difficult to nnderstand how Dr. Stnr has included his 

 two figures of Sigillaria Taylori under Lepidodendvon Velt- 

 heimianum^ as no state of preservation or age could account 

 for the leaf-scars of Lepidodendron Veliheimiajium becoming 

 so altered as to assume the form and arrangement shown in 

 his '■ Culm Flora/ pi. xxxix. figs. 1, 2. His fig. 1 shows an 

 older condition of Sigillaria Taylori than his fig. 2. The 

 right-hand upper corner of this last-mentioned figure indicates 

 clearly the Sigillarian foi*m of the leaf-scar, and how close the 

 affinities of this species are with Sigillaria discophora. Mr. 

 D'Arcy Thompson has figured an example of this species 

 {Ulodendron minus, 1. c.) with the lower portion of the appen- 

 dicular organ attached. The Clathrarian form of the leaf- 

 scars is well shown in his figure, but even better on his 

 specimen, which he has kindly lent me for examination. 



I have already gi^en a description of an example of this 

 species (No. 18), collected by Dr. Macfarlane, which shows 

 the appendicular organs in a young condition, attached to the 

 stem (PI. V. fig. 9). _ 



This species is restricted to the Lower Carboniferous (Car- 

 boniferous-Limestone series and Calciferous- Sandstone series). 



Localities. 



Scotland — From the Carboniferous-Limestone Series. 

 Linlithgowshire : Blaes, 20 ft. above Parrot Seam, No. 6 

 Pit, Grange, Bo'ness [H, M. Cadell) ; Silver-Mine 

 Quarry, Linlithgow (//. M. Cadell) ; Bathgate [type 

 of species in the collection of the British Museum). 



From the Calciferous-Sandstone Series. 



Midlothian : Camps Lime Quarry, near Midcalder [R. F. B. 

 Bishop)] StraitoD, near Loanheadj Addiewell; 

 West Calder ; Midcalder. 



I conclude by thanking the friends who have so kindly and 

 willingly submitted to me for examination many specimens^ 

 which have been of the greatest use while drawing up these 

 notes. 



EXPLANATION OF THE PLATES. 



Plate III. 



Fig. 1. Lepidode7idron Velthehniamwi, Sternberg. From Burghlee, Loan- 

 liead, Midlotliiau. Calciferous-Sandstone series. Natural size. 

 (Specimen No, 1.) 



