762 MR ROBERT KIDSTON ON THE FOSSIL PLANTS OF 



Bythotrephis gracilis, var. intermedia, pi. v. fig. 2 (I.e.), though this differs little 

 from some of the forms included under the var. crassa. The whole series of type and 

 varieties described by Hall pass insensibly into each other. 



Locality and Horizon. — From the Cementstone group of the Calciferous Sandstone 

 series in limestone beds on the shore between the gardener's cottage and Borron Point, 

 Arbigland, Kirkcudbrightshire. 



Fossil Plants of the Carboniferous Limestone Series. 



The only section of this series from which we were successful in collecting fossil 

 plants is that exposed along the right bank of the river Esk, extending from the 

 Gilnockie Limestones (which include the equivalent of the Hurlet Limestone) to im- 

 mediately above Byre Burn Bridge, where the Carboniferous Limestone Series is 

 faulted against the Middle Coal Measures of Byre Burn. 



The plants collected from this series are from the following localities : — 



A. Sandstone bed, river Esk, right bank, about 150 yards below Gilnockie Bridge. 



B. Black Carbonaceous Shale, river Esk, right bank, about 200 yards above foot 



of Byre Burn. 



C. Sandstone bed, river Esk, right bank, about 125 yards above foot of Byre 



Burn. 



Algse. 



Spirophyton, Hall. 



Spirophyton cauda-galli, Vanuxem, sp. 



Spirophyton cauda-galli, Vanuxem, sp. See ante, p. 744. 



Locality C. — Entirely filling a bed of sandstone. 



Lycopodiacese. 



Lepidodendron, Sternberg. 



Lepidodendron Glincanum, Eichwald, sp. 



(Plate II. figs. 20, 21 ; Plate III. figs. 27, 28 ; Plate IV. figs 37-40 ; 



Plate V. figs. 41-43.) 



1860. Sagenaria Olincana, Eichwald, Lethxa Rossica, vol. i., Ancienne Periode, p. 127, pi. v. figs. 21— 



22, pi. \a. figs. 1-10. 

 1870. Lepidodendron Glincanum, Schimper, Traite d. paleont veget., vol. ii. p. 34. 

 1883. Lepidodendron Glincanum, Schmalhausen, Die Pflanzenreste der Steinkohlenformation am Ostlichen 



Abhange des Ural Gebirges (Mem. VAcad. Imper. d. Sc. d. St Petersbourg, vh e s^r., vol. xxxi. 



No. 13), p. 11, pi. ii. figs. 5-16, pi. hi. figs. 1-19, pi. iv. figs. 1-5. 



Description. — " Leaves narrow, linear, sharp-pointed, spreading, seldom upright, 

 bent in a sigmoid manner. Sporangia! portion of bracts at right angles to the axis, free 



