RADSTOCK SERIES OF THE SOMERSET AND BRISTOL COAL FIELD. 345 



Macrostachya infundibuliformis, "Weiss, Steinkohlen-Calamarien, part i. p. 71, pi. vi, figs. 1-4;: 



pi. xviii. figs. 1, 3, 4 (1876) ; part ii. p. 197 (1884). 

 Equisetum infundibuliforme, Brongt. (in part), Hist. d. veget. foss., p. 119, pi. xii. figs. 14, 15 



(excl. syn. and fig. 16). 

 Huttonia carinata, Germar, Vers. v. Wettin u. Lbbejun, p. 90, pi. xxxii. figs. 1, 2. 

 Macrostachya carinata, Zeiller, Veget. foss. du terr. houil., p. 23, pi. clix. fig. 4. 

 Equisetum, Brongt., Class, d. veget. foss., p. 90, pi. iv. fig. 4. 



Remarks. — Very rare ; only two examples having been found. 

 Localities : — Radstock ; Kilmersdon. 



Filicace^:. 



Sphenopteris, Brongniart, 1822, Sur la Classification d. veget. foss., p. 33. 



Sphenopteris tenuifolia, (Brongt. ?) Gutbier. 

 Plate XIX. fig. 2. 



(?) Sphenopteris tenuifolia, Brongt., Hist. d. veget. foss., p. 190, pi. xlviii. fig. 1. 



Sphenopteris tenuifolia, Gutbier, AbdriicJce u. Vers. d. Zwiclmuer Schwarzlwhl, p. 39, pi. v. fig. 10; 



pi. x. fig. 9. 

 (?) Clieilanthites tenuifolius, Gb'ppert, Syst. fil. foss., p. 241. 



Description. — Frond tripinnate ; primary (?) and secondary pinnae alternate, 

 lanceolate ; pinnules alternate, lanceolate ; lower pinnules divided into numerous 

 (as many as fourteen) segments ; the lower segments are again divided into 

 four to six simple or bifid lanceolate acute teeth ; upper pinnules less divided, 

 bearing simple, bifid or trifid acute lanceolate segments, into each of which 

 extends a vein. Rachis of pinnae thin. Fruit borne at the extremities of the 

 secondary (?) pinnae, and situated at the margin of the pinnule segments. 



Remarks. — The specimen, of which a drawing is given natural size, shows 

 two (?) primary pinnae lying parallel to each other. As their parent rachis is 

 not shown, their entire length cannot be estimated. The portions of the pinnae 

 preserved measure about 6 inches each. 



This, the only example which I have seen, is beautifully preserved, and 

 shows the most minute details of the pinnule cutting. The lower pinnules of 

 the lower secondary pinnae are much divided into broadly lanceolate segments, 

 and the lower segments are again divided into a few simple and bifid acute 

 lanceolate teeth, into each of which runs a vein. A careful drawing of one of 

 these pinnules, magnified three times, is given on Plate XIX. fig. 21). An upper 

 pinnule, also enlarged three times, is shown at fig. 2a ; the segments of this are, 

 with one exception, bifid, but these details vary according to the position of 

 the pinnule on the pinna, the uppermost pinnules being even less divided. 



The fruit is borne on the upper secondary pinnae, apparently at the margins 

 of the pinnules. Its structure is not well shown, the fruit appearing as little 

 indistinct groups at the extremities of the ultimate segmentation. Owing to the 

 somewhat indistinct details of the fruit, I am led to believe it had not reached 

 maturity, as the other parts of the specimen show their structure exquisitely. 



