PRELIMINARY OBSERVATIONS. i 
Breslau, originally derived from Ehstland, and stated to be of the age of the Llandovery 
Rocks. 
M. Barranpe’s: monograph, “ Ueber die Brachiopoden der Silurischen Schichten 
von Bohmen,” published in the ‘ Naturwissenschaftlichen Abhandlungen, Wien,’ 1847 
and 1848, is by far the most important work on German Silurian Brachiopoda ; 
it is illustrated by eighteen quarto plates; but Mr. Barrande informs me that he 
has under preparation another similar but more extensive monograph, wherein some two 
hundred Bohemian species of Silurian Brachiopoda will be described and fully illus- 
trated. I look forward with deep interest to the publication of the last-mentioned work ; 
for, coming from the pen of so eminent and able a paleontologist, this monograph will be 
im every respect most valuable. 
Among the German authors who have published lists, figures, and descriptions of 
some Silurian Brachiopoda, I should have mentioned various works of E. von 
ScutotHEim, the most remarkable of which is ‘Die Petrefactenkunde,’ published at 
Gotha, in 1820. Brown, in his ‘ Index Paleontologicus,’ published in 1848, gives us 
a general list, with references of all the Silurian Brachiopoda then known to him. Some 
interesting descriptions and figures will also be found in Fr. A. Quensrept’s ‘ Hand- 
buch der Petrefactenkunde,’ 1851. 
FRANCE 
Is not rich in Silurian Brachiopoda, and consequently not much has been written there 
upon the subject. We may, however, mention two papers by Marre Rovavtt, on some 
species found in Brittany and Normandy ; they are published in the seventh and eighth 
volumes, second series, of the ‘ Bulletin de la Soc. Géol. de France.’ In D’Orsieny’s 
‘Prodrome’ (1849) will also be found a catalogue of Silurian Brachiopoda compiled 
from then existing materials. 
SPAIN AND PORTUGAL. 
We are chiefly indebted to M. pz Verneurt for the little we know concerning Spanish 
Silurian Brachiopoda, and this will be found in the twelfth volume, second series, 1855, — 
of the ‘ Bulletin de la Société Géologique de France. With reference to Portuguese 
species, a paper was published by Mr. D. Suarpg, in the ninth volume of the ‘ Quarterly 
Journal of the Geol. Soc. of London.’ 
