532 ROBERT KIDSTON ON FOSSIL PLANTS 
CANONBIE PLANTS. ALETHOPTERIDER. 
FILICACER. 6. Alethopteris heterophylla, Sternb. 
PECOPTERIDES. 
SPHENOPTERIDES. : : 
. : | 7. Pecopteris nervosa, Brongn. 
1.tSphenopteris multifida, L. & H. 8 sp. 
2. > obtusiloba (?), Brongn. 4 
3 sp EQuisETACER, 
3. FA : 7 
4. Staphylopteris, sp. 9. Calamites, sp. 
LycopoDIACcEz. 
NEUROPTERIDER. 10. Lepidodendron, sp. 
5. Neuropteris heterophylla, Brongn, 11. Lepidophyllum lanceolatum, L. & H. 
In comparing the list of the species contained in this collection (except those 
from Canonbie) with the fossil plants from the Calciferous Sandstone series 
in the neighbourhood of Edinburgh, their similarity will be at once apparent. 
This is remarkable when viewed in relation to the fish and crustacean 
remains which have been already described from Eskdale and Liddesdale, by 
R. H. Traquatr, Esq., M.D., F.R.S., and Beng. Peacu, Esq., F.R.S.E., which, 
as far as at present known, are mostly peculiar to these districts. 
This points to some local physical conditions, which, though favourable for 
the growth of plants, widely distributed in other parts of Scotland, seem to have 
favoured the existence of a fauna peculiar to itself. 
DESCRIPTION OF GENERA AND SPECIES. 
THALLOPHYTA. 
ALG, 
Chondrites, Goppert. 
Fucoides, Brougn. 
Chondrites plumosa, sp. nov., Kidsten. 
Plate XXX. fig. 3, and Plate X XXII. fig. 2. 
Description.Frond much branched, pinne about an inch long, densely 
covered with short filamentous segments. Main and secondary axes threadlike. 
Remarks.—None of the specimens of this plant are complete, so its original 
length cannot be ascertained. It must have been a much-branched species, 
and attained some inches in length. 
The whole plant appears to have been very delicate, and the ultimate 
divisions of the fronds are clothed with closely-set and very fine filamentous 
segments about a quarter of an inch long, which give it a plumose 
appearance. 
It is all but impossible to place fossil A/gw in a true systematic classifica- 
