230 Proceedings of the Royal Physical Society. 
the various species of the genus Pecopteris—those species 
- which belong to the Cyatheites group of Goppert. 
In British Upper Coal-Measures these ferns are repre- 
sented by Pec. arborescens, Schl. sp., and var. cyathea, Brongt. | 
sp., Pec. oreopteridia, Schl. sp., Pec. Cistir, Brongt., Pee. 
Bucklandii, Brongt., Pec. pteroides, Brongt., Pec. crenulata, 
Brongt., Pec. pinnatifida, Gutbier sp., Pec. Lamuriana, Heer, 
Pee. polymorpha, Brongt., Pee. Candolliana, Brongt., Pee. 
unita, Brongt., and forma emarginata, Gopp. sp. 
_ None of these have been found out of this series. Pee. 
Miltoni, Artis sp. (=Pec. abbreviata, Brongt.), also occurs 
plentifully, but it is likewise met with in the Middle Coal- 
Measures. 
Several of these forms are very common in this series— 
especially Pee. arborescens, Schl. sp., and var. cyathea, Pee. 
oreopteridia, Schl. sp., and’ Pec. wnita, Brongt. 
This group of ferns is enough in itself to distinguish the 
Upper from the other series of the Coal-Measures, and they 
impart to these rocks a very distinct botanical facies. In the _ 
Radstock and Farrington Series, Somerset, it is almost impos- 
sible to split a block of shale—locally called “greys” —without 
finding traces of one or other of these Pecopterids. They out- 
number in quantity all the other plants there met with. 
Another extremely common fern in the Upper Coal- 
Measures is -Alethopteris Serlii, Brongt. sp. Individually 
this is perhaps the commonest species of all, and occurs in 
great numbers, and though one of the most characteristic 
plants of the Upper Coal-Measures, it occurs, though very 
rarely, in the Middle Coal-Measures. 
Among other ferns which appear to be restricted to the 
Upper Coal-Measures are Sphen. macilenta, L. and H., 
Sphen. tenuifolia (Brongt.), Gutbier, Sphen. Woodwardu, 
Kidston, Corynepteris erosa, Gutbier sp., Unatheca oblonga, 
Kidston, Dicksoniites Pluckenetii, Schl. sp., Alethopteris 
‘Grandini, Brongt. sp., Desmopteris longifolia, Presl. sp., 
Odontopteris Lindleyana, Sternb., Neur. ovata, Hoffm., and 
Neur. flexuosa, Brongt.. . The ae is common, and JVeur. 
ovata is frequent. 
» Several. species of Rhacophylium are also met with. Some 
