718 
small town of Schavli, in the government of Wilna, occupied by 
upper Silurian rocks, which they discovered in their journey to: St. 
Petersburgh, and which they place as the highest member of the’ 
system, or above the principal masses: of the: Orthoeeratite and Tris 
lobite limestone and beneath the overlying old red or Devonian 
formation. In this limestone fifteen species. of fossils were observed, 
including Pentameri, Terebratule , and: Orthide; and:it is; considered: 
to be'the representative of a\ calcareous rock which ranges: to: the 
north of Dorpat and Weissenstein, and:is known: at Oberpahlen, é&ct 
Notwithstanding their almost perfectly horizontal position, the strata 
in the Baltic provincesof Russia indicate most clearly a passage from: 
a lower horizon’ om the north to a higher on the:south, where they» 
are surmounted: by the: Devonian. system. oi 10F 
In announcing a large accession of Silurian fossils: to: their former: 
lists, the authors advert. to: the: labours: of Professor Kichwald)) 
who after a personal examination ef the coast-cliffs: and: of: the 
Isle: of Dago, has been sedulously occupied in describing: many, new 
species. They also dwell upon the important additiom to) their! 
knowledge of new forms contributed: by Dr. Worth,. the secretary 
of the Imperial Academy of Mineralogy,—forms which they purpose! 
to figure and describe ini the: course of the ensuing winter; and they! 
acknowledge them: obligations to Colonel: Helmersen and the: officers: 
of the School of Mines, for aiding them: in their acquisition: of fresip 
knowledge concerning the contents of these the most ancient de+ 
posits of the Russiam empire. Im their tabular: list of fossils: the 
authors give the following as: characteristic’ of, and in part peculiar’ 
to, the Silurian rocks of Russia :-—., : 
Asaphus: expansus (Dalm.*), As cornutus, IlMenus: crassicauda 
(Dalm.*), Amphyx nasutus (Dalm.*), Orthoceratites vaginatus: 
(Schloth.+), Litutes convolvens: (Schioth.+), Clhymenia Odini, 
(Kichw.}), Ferebratula Wilsont (Sow. in Sil. Syst.), DB. sphente 
(Von Buch®), T. camelzna (Von Buch); Orthis anomala (Terebrat.i 
Schloth.+), 0. Uralenszs", n.s., O. Panderi, n.s., O..cincta (Kichw.t);} 
Leptena imbrex (Pand.,), Leptena rugosa (Dalm.||), Spirifer bifo= 
ratus) (Terebrat. id. Schloth.), S. lynx (Kichw-{), .S. e@quirostris 
(Terebr. Schloth.), 8. porambonites (Von Buch$), Pentamenus Vogu-! 
licus*, n.s., very nearto P. Knightit (Sil. Syst.), Cranaa antaquassima, 
nob. (Orbieula antiquissima, Eichw.t), Lingula quadrata (Bichw.f);. 
(ZL. Lewisit, Sil. Syst.), Ungulites: (Pand.{),. Obolws ( Eichw.); 
Spheronites aurantium (S. citrus, His.**), Elemecosmites pyriformas 
* On Palzeaderna: eller de sa’ Kallade: Trilobiterna:. Stockholm, 1828, 
+ Die Petrefactenkunde der Vorwelt: 8vo. Gotha, 11820. 
{ Sur le Systéme Silurien de |’Esthonie: Svo. St. Petersbourg,. 1840.., 
§ Beitrage zur Bestimmung der Gebirgsformationen in Russland. 8yo.. 
Berlin, 1840. 
|| K. Vet. Acad. Handl. 1827. 
' ¥ Beitrage zur Geognosie des Russischen Reiches. 4to. St. Petersburg, 1830. 
** Lethea Suecica. 4to. Holmiz, 1837. 
1 The fossils marked (1) occur in the Ural mountains only. 
