RADSTOCK SERIES OF THE SOMERSET AND BRISTOL COAL FIELD. 405 



General Eemarks. 



The genus Catamites, though represented by several species, is not of very- 

 frequent occurrence. Calamocladus is also rare. Spkenophyllum, as far as at 

 present known, is only represented by one species. Though seven species of 

 Sphenopteris have been met with, none of them are of frequent occurrence. 

 Neuropteris is represented by six species, of which N. macrophytta and N. 

 Scheuchzeri are the most common, the former being especially plentiful. Dicty- 

 opteris is very rare, only a single specimen having been seen. Odontopteris is 

 not much more common. No less than fifteen species of Pecopteris have been 

 observed ; of these P. arbor escens, P. Miltoni. P. oreopteridia, and P. unita are 

 the most plentiful, the two first-mentioned species being especially common. 

 Dactylotheca is also of frequent occurrence. Of the six species of Aletltopteris, 

 only A. Serlii is common, but that is extremely plentiful. None of the species 

 of Rhacophyllum are common. Megaphyton and Caulopteris are also rare. 

 Lepidoclendra are not very common, but L. Wortheni is the species most fre- 

 quently met with. The genus Lepidophloios is very rare. The Sigillariw are 

 represented by eight species, the commonest being & tessellata. Cordaites, 

 though only represented by one species, is in some localities very plentiful. 

 Poacordaites is, on the other hand, very rare. The genera Cardiocarpus, 

 Trigonocarpus, Rhabdocarpus, and Carpolithus are of somewhat rare occurrence. 



For the purpose of comparing the fossil plants from the Radstock Series 

 with those of other coal fields, I append a table, in the first column of which 

 are given the plants of the Radstock Series ; Column II. shows the Radstock 

 species that occur in the Coal Measures of France ; and Column III. those 

 common to the Zwickau Coal Beds.* Columns IV. and V. give the fossil 

 plants common to both the Radstock and the Saarbrtick and Ottweiler Series 

 respectively.t 



It must be borne in mind that the following Tables only show wherein the 

 Floras of these respective areas agree with that of the Radstock Series, and do 

 not take any note of the plants occurring in the various horizons taken for 

 comparison which do not occur in the Radstock Series. If this point were 

 taken into consideration, it would be found that each series has species more 

 or less peculiar to itself. 



* Compiled from Geinitz, Foss. Flora d. Steirikf. in Sachsen. 

 f Weiss, Foss. Flora d. jiingst. Stic. u. d. Roitil., p. 237. 



[Tabus. 



