= 
Geology. 137 
lowing is a list of the species described from the Potsdam Group at this 
ace, viz :—Paleophycus encipiens, Archeocyathus Atlanticus, A. Min- 
ganensis, Obolus Labradoricus, Obolella chromatica, O. cingulata, Cono- 
cephalites miser, Bathyurus senectus, B. parvulus, Salterella rugosa, S. 
obtusa, and S. pulchella. 
Mr. Billings also identifies amongst the fossils from this group at the 
Straits of Belle Isle, Scholithus linearus, and two species of trilobites 
tibed by Prof. Hal , from Vermont, in 1859, under the name Olenus 
Thompeoni and O. Vermontana. Prof Hall supposed these two trilobites 
to belong to the Hudson River Group, but the great Bohemian geologist, 
give of their associates both in Vermont and at Belle Isle. Mr. Hall 
s Since created from them a new genus, BARRANDIA. ee 
*rom rocks of the same age in Vermont the paper under review con- 
tains descriptions of the following species, viz :—Pale nycus congrega- 
ius, Orthisina Jistinata, Camerella antiquata, Conocephalites Adamsi, C. 
er, C. arenosa and C. ; : 
It likewise contains descriptions of the following new species from rocks 
‘of the age of the Trenton, Chazy and Black River limestones in Canada 
Vermont, viz :— Eosponzia Roemerii, E, variens, Astylospongia par- 
Tan langula Perryi, Lituites Fainsworthi, L. imperator, and Ampyz 
i, 
mordial types, which view is clearly established by Mr. Billings’s investi- 
The new genera established in this memoir are Hospongia, Archeocya- 
thus, Obolella, and Saiterella. The first two of these genera seem to 
belong to the Amorphozoa,—the second includes small Brachiopods, allied 
It is an interesting fact that Meek and Hayden have ae identified 
ory. ‘ 
the ition to its great usefulness in developing the natural resources of 
coun , the Ci ow sie is in L: . t ote io - to scienc 
and Nehly ‘deserves the liberal government patronage it is receiving. 
tice wa Hayden's article on page 68 (and following), of this volume, for a no- 
facts here alluded to. 
a% Joun. Sc1.—Szcoxp Serres, Vor. XXXIII, No. 97.—Jax., 1862. 
18 
