422 Scientific Intelligence. 
Quebec trilobites, and before my letter communicating this new evidence 
reached him he had written to Prof. Bronn the letter which has already 
appeared in these pages, (see xxxi, p. 212). The Quebec fossils removed 
all doubt from my mind at once. But it was not until I had procu 
professes to claim priority over Dr. Emmons, whose reputation as the 
originator of the idea of a pre-silurian fauna in America is world-wide. 
In the table of fossils, p. 104, the species, P. congregatus belongs to 
the Vermont column and not to the other. Also the word Koturgina 
should be Kutorgina. 
4. Observations upon the rocks of the Mississippi Valley which have 
been referred to the Chemung Group of New York, together with descrip- 
tions of New Species of fossils from the same horizon at Burlington, 
Towa ; by C. A. Wurre and R. P. Wurrrietp. [Proceed. Boston 
, Leda, Macrodon, Conocardium, Cypricardia ?, Cypriar 
della, Edmondia, Euomphalus, Platyceras, Pleurotomaria, Murchisoma, 
Porcellia and Bellerophon. 
_ These fossils were all collected at and near Burlington, Iowa, from & 
series of more or less arenaceous strata holding a position immediately 
diana, to the Marcellus Shale, holding a position far beneath the at 
mung, at the base of the Hamilton Group. Prof. Swallow and his ass 
More recently, Meek and Worthen, while investigating the fossils sag 
tained in the collections of the Geological Survey of Illinois, failing z 
H respects undistinguishable from forms known to maga 
eds above, were naturally led te dou 
emung epoch. These doubts were 
