96 Mr. E. A. Newell Arber. Fossil Flora of the [May 30, 



near Bideford, and this conclusion was confirmed and maintained by 

 Sedgwick and Murchison. 



The present paper is an attempt to extend our knowledge ot the 

 distribution of Carboniferous plants in Devonshire, and also to deter- 

 mine the horizons in the Upper Carboniferous, which are represented 

 by the Upper Culm Measures. 



The task of the collection of well-preserved plant remains from these 

 rocks has been exceedingly difficult, partly on account of the severe 

 crushing and folding which the strata have undergone, and partly 

 because, with one exception, the coal or culm is no longer worked in 

 the district. The best-preserved impressions are only found in close 

 association with the culm, and, at the present time, few traces of 

 former culm workings remain, and these are fast disappearing. Thus, 

 the specimens described here, are in some respects unique, and, in many 

 cases, only a single example of the species is known. 



The coal or " culm " forms a number of inconstant bands of no great 

 thickness, which run from the western coast-line through Bideford for 

 a distance of 12 miles to the east, near Chittlehampton. These bands 

 are practically confined to one horizon, and this is one of the very few 

 horizons which can be recognised in the great series of the sandstones 

 and shales of the Upper Culm Measures by its lithological character. 

 In the present paper, attention has been confined to the flora of these 

 beds. 



Several species of plant remains have been already recorded by 

 De la Beche, Sedgwick and Murchison, and T. M. Hall, and, of most 

 of these, further specimens have been collected, and, in addition, 

 many records new to Devonshire have been made. Among the latter 

 may be mentioned the first British record of Neuropteris Schlehani, 

 Stur, a frond of common occurrence in the Coal Measures of the 

 Continent, and a leaf new to Britain, which somewhat recalls Dawson's 

 genus, Megalopferis, chiefly known from the Coal Measures of Canada 

 and the United States. 



Determinations from the Bideford District. 

 Eguisetales. 



Catamites (CalamUina) undulatus, Sternb. 

 Catamites (Eucalamites) ramosus, Artis. 

 Calamites (Stylocalamites) Suckwoi, Brong. 

 Catamites (CalamUina) varians, Sternb. 

 Calamites sp. (external surface). 

 Annularia radiata, Brong. 

 Annalaria cjalioides (L. and EL). 

 Calamocladus equisetiformis (Schl.). 

 Calamodadm charceformis (Sternb.). 

 Calamostachys longifolia (Weiss). 

 Pinnularia sp. 



