Palceozoic Species mentioned in "Fossil Flora!' 3 69 



PI. ex. A Fossil Aquatic Eoot. 



Locality. — Felling Colliery. 



Horizon. — Lower Coal-Measures. Low Main Seam. 



Remarks.— T\i\^ is the Pinnularia gracilis, Artis sp., 

 which I really do not think can be separated on stable 

 characters from the Pinnularia columnaris, Artis sp. 



PI. cxi. Pinnulaiua capellacea, L. and H. 



Locality. — Leebotwood Coal Pit, four miles from Church 

 Stretton, Shropshire. 



Llorizon. — Coal-Measures. 



Remarks. — This is probably only a different condition of 

 the last. There is no doubt that roots of different plants 

 may assume very similar forms, but these various Pinnularia 

 so pass into one another that it is very difficult to draw a 

 hard and fast line between the so-called species. 



PL cxii. Lepidodendron Sternbergii. 

 Locality (a and c). — Hebburn Colliery. 

 Locality (h). — Coalbrookdale. 

 Horizon. — Coal-Measures. 



Remarks. — All the specimens figured here are referable to 

 Lepidodendron ophiurqs, Brongt. 



PL cxiii. Lepidodendron selaginoides. 



Locality. — Felling Colliery. 



Horizon. — Lower Coal-Measures. Pioof of Low Main Seam. 



Remarks. — Lindley and Button's specimen I have not 

 seen. Their plate agrees well with Sternberg's type figures, 

 but they both fail to indicate, either in the figures or descrip- 

 tions, any definite character by which this species can be 

 distinguished from Lepidodendron ophiurus, Brongt. Judging 

 from the figures, the specimens do not appear, from their 

 state of preservation, to be in a condition to afford the neces- 

 sary characters for a well-founded species. I do not see 

 therefore that we can do otherwise than class Lepidodendron 

 selaginoides under the head of " Species insufiicicntly known.'' ^ 



^ I am awave that some authors regard Lepidodendron selaginoides, Sternb., 

 as a good species. Lepidodendron selaginoides, Sternb., must not be confused 

 with the specimens showing structure which have been described under the 

 name of Lepidodendron selaginoides — as there is no evidence to show tliat 

 these structure-showing stems belong to Sternberg's species. 



