420 



ing, that the verticilli are nearer to each other, than in the plants 

 with which it has been compared. This specimen is an iron-stone, 

 the fractured surface being of a rusty colour. Fig. 4, of the same 

 Plate is a micaceous sand-stone, bearing a delicate, but very per- 

 fect and beautiful impression of a leaf, which, bearing no peculiar 

 characteristic marks, cannot be referred to any particular plant. 

 Fig. 5, of the same Plate represents the leaf of some plant, entirely 

 unknown, in an iron-stone nodule. The kind represented Fig. 9, of 

 the same Plate, on a coal schist from Wales, very much resembles 

 the specimen figured Tab. III. Fig. 7> of Scheuchzer's Diluvian 

 Herbarium, p. 19 ; of which he says, " haud abludit Filix non ra- 

 mosa major, pinnulis longis angustis, profunde dentatis, suprema 

 pinna longius mucronata." Pluk. Amalth. Botan. p. 93. tab. 403. 

 Fig. 10, is the remains, little more than the stalk appearing, of, per- 

 haps, an Equisetum, in an iron-stone, of a red colour, from Coal- 

 brook-dale, in Shropshire. Fig. 11. is also from Coalbrook-dale, and 

 is in an iron-stone of the same colour with the former. It contains 

 a plant probably of the same genus also : the fossil described by 

 Lhwydd, at No. 202, approaches near to it. This he describes as 

 Aparinae densius foliatae aemulum Lithophyton radiosum. E fodinis 

 Glamorgensis. The plants in both these specimens appear to be 

 unnaturally contracted or shrunk. Whether this appearance pro- 

 ceeds from the direction in which the leaves are placed, presenting 

 little more than their edges, I cannot determine : both specimens, 

 however, may owe their colour to the action of fire, to which they 

 may have been exposed. Fig. 8. of the same Plate represents one 

 of these impressions of schisti, already mentioned, as described by 

 Dr. Woodward, from the coal mines of Haigh, in Lancashire. 



Mr. Da Costa, in a paper on the impressions of plants, on the 

 slates of coals (schistus terrestris niger carbonarius), found immedi- 

 ately on the coal stratum, not only of this kingdom, but in France, 

 Saxony, Bohemia, Silesia, &c. conjectures that they are impressions, 



