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OF THE BALTIC PKOVI!S T CES OF RUSSIA.
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in Finland to Kalmar in Sweden. The section is delineated on
page 59 (P 8) of my memoir, and may be repeated at this place.
Ideal Section of the Silurian Formation between Wiborg in Finland
and Kalmar in Sweden.
S.W. M".E.
a. Upper Silurian.
b. Lower Silurian.
Concluding: Remarks.
Cambrian.
In the foregoing pages I have merely given an account of the
stratigraphical part of my memoir. I may now be permitted to
make also a few remarks upon its palaeontological contents. Com-
mencing in the year 1853, but delayed by interruptions caused by Si-
berian expeditions from 1859-63 and 1866, and by a long illness
from 1868-70, I have spent the largest part of each summer in
studying our Silurian system and in collecting fossils from it. I have
founded a separate Silurian collection in the provincial museum of
Reval, where I have left sufficient room to place all the rich materials
brought together every summer from the various points of our
Silurian territory. In addition, Silurian fossils in the remaining
museums of our country are at my disposal, for instsnce, the col-
lection of Volborth, in the Museum of the St. Petersburg Aca-
demy, the collection of Eichwald, presented to the St. Petersburg
University, the collection of Pander in the St. Petersburg School
of Mines, the collections at Dorpat in the University Museum and
the Museum of the Natural-History Society, &c. Not only so, but
I have visited several times the museums of Sweden and Norway,
and the most important Silurian localities in those countries. In
1875 I had also the opportunity of studying for a few days the
British collections. Moreover, I have studied divers collections of
Silurian erratics in the museums of Northern Germany, from which
region many species have been described which have not hitherto
been found in their original beds. In this way it is possible for me
to make full use at one time of all the different collections from our
Silurians, brought together at different times by divers collectors

and it is my purpose to perform the task of describing and figuring,
in an accurate way, all our Silurian fossils, if my life be spared.
The memoir I have just completed contains the descriptions and
figures of three families of Trilobites, the Phacopidae, Cheiruridae,
and Encrinuridoe, altogether 60 species. The number of all our
Trilobites will be about 150 species, of which only 15 are Upper
Silurian; all the rest are Lower Silurian. The next part of