144 MR ROBERT KIDSTON ON THE FRUCTIFICATION OF 



pinnules towards the centre of the pinnae are longest. The pinnules of the 

 superior side of the pinnae are longer than those on its inferior side. 

 Figs. 17, a, b, c, show some of the pinnules slightly enlarged. 



There is another example from Burdiehouse in the " Hugh Miller Collec- 

 tion," Museum of Science and Art, Edinburgh, which is interesting as showing 

 very beautifully the bifurcation of the main axis, below which, as well as on 

 the two arms of the fork, the frond bears barren pinnae. It further shows 

 that the pinnae within the fork are shorter than those attached to the outer 

 side of the fork, a character well shown in fig. 16. 



Several specimens, also showing the bifurcation of the main axis, are 

 contained in the Collection of the Geological Survey of Great Britain. 



My thanks are due to Dr Traquair, keeper of the Natural History Depart- 

 ment, Museum of Science and Art, Edinburgh, for permission to figure the 

 specimen shown on PL IX. fig. 16. 



Horizon. — Calciferous Sandstone Series. 



Localities : — 



Scotland. — Burdiehouse, near Edinburgh ; Muir Burn, Kershope Burn, and 

 Tweeden Burn, Liddesdale ;* and River Esk, Glencartholm, Eskdale. # 



England — Northumberland. — Shore section, Sandstone Quarry, a little 

 south of Sea Houses; Bateinghope Burn, 1 mile from head of stream, Redesdale; 

 east bank of Lewis Burn, Barney's Cut, a little more than ^ mile south-west 

 of Lewis Burn Bridge, North Tynedale ; Lewis Burn, more than 200 yards 

 below Lewis Burn Colliery, North Tynedale; Buck Burn, f mile north-west of 

 Willow Bog, Oakenshaw Burn, North Tynedale ; Cranecleuch Burn, opposite 

 Cranccleuch New Houses, Whickhope Burn, North Tynedale ; foot of Sauchy 

 Sike, Little Whickhope Burn, North Tynedale; Rigend Burn, Kielder, N. 

 Tynedale. Cumberland. — River Irthing, \ mile north of Lampert (county 

 boundary, Northumberland and Cumberland); foot of streamlet, f mile south- 

 west of Wileysike, River Irthing ; River Irthing, 2 miles north-east of Water- 

 head ; River Irthing, £ mile east of Waterhead ; Bothrigg Burn, near its head, 

 1 mile east of the Flat, Bewcastle; stream between Oakshaw and Whinting- 

 stone, Clattering Ford, Bewcastle.t 



* Collected by Mr A. Macconchie, Fossil Collector to the Geol. Sur. of Scotland. 

 f The specimens from Northumberland and Cumberland have been mostly collected by Mr J. 

 Rhodes, Fossil Collector to the Geol. Sur. of England. 



