58 J. W. DAWSON ON PALZEOZOIC FOSSILS 
Corniferous formation ......... Stromatopora granulata, Nicholson. 
S. mammillata, JV. 
S. Hindei, J. 
8. perforata, LV. 
8. ponderosa, IV. 
8S. substriatella, NV. 
S. tuberculata, NV. 
Syringostroma columnare, JV. 
Coenostroma densum, _V. 
Hamilton formation ............ Stromatopora nux, Winchell. 
S. ceespitosa, W. 
Ceenostroma monticulifera, W. 
C. pustulifera, W. 
Chemung formation ........60. Stromatopora expansa, Hall, 
S. erratica, H. 
8. alternata, H. 
Caunopora incrustans, H. 
Ceenostroma solidulum, 4. 
C. planulatum, ZH, 
Il, Patxozorc Fossils ASSOCIATED WITH SERPENTINE AND OTHER 
Hyprovs SILicaTEs. 
Fossils having their cavities and pores infiltrated with hydrous 
silicates are much more abundant in Paleozoic limestones than is 
usually imagined. In some instances serpentine itself is found to 
have been concerned in such infiltration; while in other cases the 
infiltrating hydrous silicates are found to approach to pollyte, fah- 
lunite, and other minerals which have usually been regarded as pro- 
ducts of decomposition or metamorphism, but which, as Dr. Sterry 
Hunt has justly remarked, cannot reasonably be referred to such 
an origin when they are found filling the pores of Crinoids and other 
fossils in strictly aqueous deposits. In this case they must surely be 
the results of original deposition in the manner of glauconite ; and, 
as we shall find, they sometimes appear to be strictly the represen- 
tatives of that mineral, which occurs under similar conditions in other 
parts of the same formations. 
1. Serpentine of Lake Ohebogamong.—Mr. Richardson, of the 
Geological Survey, has observed, north of the Laurentian axis, on 
-the Saguenay River, certain rocks which appear to be similar in 
mineral character to the Quebec group of Sir William Logan, and 
occupy a geological position intermediate between the Laurentian 
and the Trenton formation. Among these he describes a band of 
serpentine associated with limestone at Lake Chebogamong, which 
lies about 200 miles to the N.E. of Lake St. John, in a little-explored 
region. Among the few specimens which Mr. Richardson was able 
to bring back with him was one of extreme interest—a specimen 
apparently from the junction of the limestone and serpentine, and 
containing a portion of a tabulate coral, of which some of the cells 
are filled with a mixture of serpentine and calcite, and some with 
calcite. The serpentine seems to have been weathered; it has a 
granular, uneven appearance, and under the microscope shows 
patches with fibrous structure like chrysotile. There are also 
whitish serpentine veins, fringed with chrysotile or a mineral re- 
