RADSTOCK SERIES OF THE SOMERSET AND BRISTOL COAL FIELD. 387 



become sinuous and lobed; in iv. tins is more marked, a few of the lower 

 secondary pinnae bearing the ultimate pinnulation of the species. 



The fasciculate arrangement of the veins is specially observable in those 

 pinnae with dentate or slightly lobed margins, but even in the upper entire 

 pinnae the veins show the same tendency. Pinna v. represents the most com- 

 pletely divided condition of the fern. 



The pinnules are ovate, the pair at the base of the pinnae being usually sub- 

 rotund. The pinnules are very blunt, and united for about one-third of their 

 length. The central vein is strongly marked, lying in a little furrow, and 

 divides into several branches at its apex. From its sides are given off 

 numerous once-divided veinlets. A few veins also enter the pinnules direct 

 from the rachis to which they are attached. These are either simple or divided 

 (see fig. la). 



The species is very rare in the Radstock Series, only two specimens 

 having come under my notice; both of these are, however, fine. One is in 

 the collection of the Bristol Museum, and the other is in the collection of 

 the Bath Museum. 



Localities; — Radstock ; Camerton. 



Spiropteris, Schimper, Traite d. paleont, veget., voL i. p. 688, 1869 1 



Spiropteris, sp. 



Remarks. — Under this name I place a specimen of Pecopteris in circiuate 

 vernation. It is impossible to determine the species to which this example 

 belongs. 



Locality : — Braysdown. 



Rhacophyllum, Schimper, Traite d. paliont. veget., vol. i. p. 684, 1869. 

 Rhacophyllum crispum, Gutbier, sp. 



Fucoides crispus, Gutbier, Vers. d. Zwick. Sclvwarzkohl, p. 13, pi. i. fig. 11 ; pi. vi. fig. 18. 



Aphlebia crispa, Zeiller, Veget. foss. d. ten: houil., p. 95. 



Rhacophyllum Lactuca, Schimper, Traite d. paleont. veget., vol. i. p. 684, pi. xlvi. fig. 1; pi. xlvli. 



fig. 1 (21); vol. iii. p. 524. 

 Schizopteris Lactuca, Geinitz, Vers. d. Steinkf. in Sachsen, p. 19, pi. xxvi. fig. 1. 

 Schizopteris Lactuca, Germar, Vers. d. SteinJc. v. Wettin u. Liibejun, p. 45, pis. xviii., xix. 

 Fucoides linearis, Gutbier, Vers. d. Zwick. Schwarzkohl, p. 13, pi. i. figs. 10, 12. 



Remarks. — Not common. 



Localities : — Radstock ; Braysdown Colliery ; Camerton. 



