Mineralogy and Geology. 259 
4. Geological Survey of Canada. — Catalogue of the Silurian Fossils 
of the Isle —— with descriptions of some new genera and spe- 
cies ; by E. Briitnes, Paleontologist, F.G.S, 93 pp., 8vo, with 42 wood- 
cuts. aia heal: Nov., 1866.—The whole number of species enumera- 
m 
130 are here for the first time made known to Science. Altogether they 
represent over 70 genera of Protozoa, Radiata, Mollusca, and sbrteudeae 
these genera, the following are new, viz., Zschyrinia,—-a genus of bi- 
valves apparently _ to the Trigoniidee ; Streptoceras, a Cephalopod 
like Ormoceras with a trilobate aperture like Phragesarsae —and 
Sarrichnites, arene to be the tracks or trails of a Mollusk. In _ 
merating the species previously described, full references are given to 
the works in which the desc scriptions were originally ‘published ; while 
the larger —— of the new species are illustrated by good wood-cuts, 
printed i in the tex 
In regard to his genus Pasceolus, published some time back, the 
author says he thinks the evidence upon which it has been refer red by 
others to the Cystidea, not conclusive; and he cre that he had, as 
some have thou ht, regarded : as ein —— affinities. He 
h 
in Vermont are called the Georgia at 9 Red sandstone character- 
ized by Olenus Vermontana, 0. Thompsoni, Conocephalites Adamsi, &e., 
also probably including the St. John’s Salas (of Jukes) Newfoundland, 
and the Paradoxides beds near Boston. 
The upper Potsdam he views as bei ng composed of the Minnesota and 
Wisconsin trilobite beds, and pone the upper part of the Potsdam 
sandstone of Canada and New Yor 
The Calciferous he likewise divides into lower and upper, the a 
being the original typical Calciferous beds, and the latter (not kaome 
Canada or New Mead) cocairTing in Newfoundland, where it is over 1000 
feet in thickness. 
Above the latter he places the Lévis formation, ~ next the Silery. 
Between the Lévis and the Calciferous formations, there is a great pa- 
leontological break, as there is also 5, Sidwace abe i and th the Chazy 
—— Une of the Trilobites in the Lévis being closely allied to those 
of the U pper Lingula flags and Tremadoc slates. 
