[MATTHEW] UPPER DEVONIAN PLANTS 105 



made new collections from Kiltorcan obtaining different parts of the 

 plant from those already known, thus greatly extending our know- 

 ledge of its special characters. Mr. Haughton knew apparently only 

 of one group of vascular tissue, in the center of his"perfectly circulai 

 leafscars," but the studies of Professor Johnson enabled him to assert 

 the presence of lateral though less conspicious vascular bundles, and 

 so bringing the bolster, in this respect, parallel to that of Lepidoden- 

 dron, and so in harmony with other genera of the Lycopodiacea. 



BoTHRODENDRON (Cyclostigma)' Kiltorkense Haughton sp. 

 By Thos. Johnson, D.Sc, F.R.S., Pub. Mar. 1913. 

 Plate I fig. 3, Plate II figs. 2 & 3, Plate III fig. 1. 



Professor Johnson was authorized to make further explorations 

 in the Kiltorcan beds by the Department of Agriculture and Technical 

 Instruction and worked at Kiltorcan in July, 1912. He carefully 

 examined each slab as it was removed; only a few isolated fish scales 

 were seen, and not a single fresh water mussel. Fragments of the 

 foliage of Sphenopteris Hookeri occurred but Professor Johnson devoted 

 himself to obtaining as complete a series of the remains of B. (C) 

 Kiltorkense as possible. He states that J. B. Jukes, Director of the 

 Geological Survey of Ireland, had this plant before him, when he 

 described a stem 5 feet long and four or five inches wide from the Old 

 Red Sandstone quarry of Tallow Bridge in Waterford, Ireland; 

 Prof. Johnson also states that of the early accounts of this species, 

 that of W. H. Baily of the Geological Survey is the best.^ Oswald 

 Heer found several of the species of Kiltorcan fossils at Bear Island 

 in the Arctic Sea (lat. 74°N.) and called the fossils of both localities 

 "Ursa Stage" which he placed as intermediate between the Devonian 

 and Lower Carboniferous.^ 



In 1886 R. Kidston pointed out that B (C) Kiltorkense showed 

 three leaf scars, and this observation was confirmed by A. G. Nathorst 

 and T. Johnson has frequently found the three scars. Bothrodendron 

 (Cydostigma) Kiltorkense dift'ers from other species of the genus 

 (punctatum, minutifolium and wickianum) in the obscurity and almost 

 general absence of the ligular scar.'* 



'I have stated on a previous page why I think Haiighton's generic name for this 

 species should be retained. 



^Journal Royal Society of Ireland, Vol. Ill, new Series; Vol. XIII (1870-1873). 



'Much of the subject matter referring to this fauna was revised by A. G. Nathorst 

 in 1894 and 1902. 



*A common mark in Lepidodendron at the lower end of the bolster. 



