L. Lesquereux on the Coal Formations of the Uniied States. 21 
who has given some figures, but without names and scientific de- 
scriptions. This Journal, vol. xxix, Ist series, contains an excel- 
lent and elaborate article by Dr. Hildreth of Marietta.* A num- 
ber of our common species of fossil plants are figured in the plates 
accompanying this paper; but the names and the descriptions of 
the plants are not given. The remarkable observations of Stein- 
haur in the Zransactions of the American Phil. Soc. of Philadelphia, 
(vol. i, new series) apply to plants observed and examined in the 
coal basin of England; and those of Harlan in the same journal 
(1831) concern only some Fucoides and have no relation to the 
coal. These are all the materials which were available for study- 
ing the American fossil plants of the coal when I began the exam- 
ination of the fossil flora of Pennsylvania in connection with the 
Geological survey of that state. ‘The Report made on this sub- 
ject contains the description of two hundred and thirty-one species 
the traces of vegetable organs found in the coal, J. W 
Dawson of Montreal. The same author has enumerated in his 
* Observations on the Bituminous Coal deposits of the Muskingum Valley, dc. 
+ This Journal, July, 1860, vol. xxx, p. 64, note. 
