410 
mus¢chelkalk species. He also determined the existence of fifteen other 
species from this deposit, none of which have been yet noticed in 
the continental Triassic group. ‘Two, if not three, of the above 
muschelkalk ichthyolites are also found at Aust; and a comparison 
of the Aust and Axmouth species gives five as common to the two 
localities, twelve as confined to the former, and two to the latter. 
The only conclusion, Sir Philip Egerton states, which he feels justi- 
fied in advancing from the facts adduced in this communication is, 
that the beds in question, hitherto considered as belonging to the 
lias, must be removed from that formation, inasmuch as they pre- 
sent a series of fishes not only specifically distinct from those of the 
lias, but possess in the Ganoid genera the heterocerque tail, an or- 
ganism confined to the fishes which existed anterior to the lias. 
Appended to the paper is a systematic catalogue, compiled from 
the ‘ Poissons Fossiles,’ of the Ichthyolites hitherto described, from 
the keuper and muschelkalk of the Content, together with those 
recently discovered at the Aust Passage and near Axmouth. The 
following extraet from that document contains the species common 
to the Continent and England :-— 
Continental Localities 
Order. Genus‘and Species. English Localities. and Formations. 
Placoid. Hybodus plicatilis. Axmouth. Passim. Muschelkalk. 
Ganoid. Gyrolepis Alberti. Ibid.—Aust. Passim. Tbid. 
iy tenuistriatus. [bid.— Ibid. Passim. Ibid. 
5 Saurichthys apicalis. Ibid. Bayreuth. Ibid. 
A letter, dated Helsingfors, January 5th, 1841, from Professor 
Nordenskidld to Mr. Lyell, ‘On Furrowed Rocks in Finland,” was 
then read. 
In consequence of Sefstrém’s observations on the lines which 
traverse the surface of the Scandinavian mountains, Professor Nor- 
denskidld has been induced to attend to similar phenomena in Fin- 
land, and he states, that he has noticed lines on almost all moun- 
tains from Lapland to the south of Finland, ranging with few devia- 
tions from N.N.W. and N. to $.8.E. and 8. On the highest cliffs 
they are seldom visible on account of the surface being worn, but 
wherever the rocks are overlaid with sand and earth the lines are 
easily discovered on the covering being removed. Professor Nor- 
denski6éld has likewise discovered shallow furrows, from three to six 
feet wide, on the surface of the north and south sand-ridges or pla- 
teaux which separate the water systems of Finland. | He has traced 
them for more than fifty fathoms maintaining the same directions 
as the lines upon the mountains, and he has noticed that they are 
sometimes near each other. The localities mentioned in the letter 
are—near the church of Kemi; between Antila and Raukula post- 
stations on the road from Tornea to Uleaberg; and at a place in 
Carelia, some miles from the iron-works at St. Anna in Suojerfoi 
parish. 
In searching for -iron-ore near Helsingfors, a shaft twenty feet 
