Lorraine Faunas of New York and Quebec 267 
ter of a mile south of the railroad, along the same road, it is asso- 
ciate-d with Strophomena fluctuosa. All of these forms are regarded 
as Catazyga headi, although only at the last mentioned locality 
the associated fauna was regarded as Richmond. 
Along the Nicolet River, southwest of Ste. Monique, Catazyga 
occurs at many horizons. The first specimens, in descending 
order, are met 97 feet below the top of the fossiliferous part of the 
Richmond, below the level of the red Queenstown shale division. 
It occurs also 7, 33, 44, 56, and 60 feet below this highest Cata- 
zyga level. At the top of this zone, 44 feet below the top, and at 
the base, Catazyga is associated with Strophomena planumbona. 
At the base, Rhynchotrema perlametlosa also is present, and the 
zone is included in the Richmond section, being regarded, together 
with the overlying fossiliferous part, as approximately equivalent 
to the Waynesville member of the Richmond. Catazyga is com- 
mon also 4 feet below the lowest Strophomena planumbona^ zone, 
and, again, at 77 feet. At various levels, between 77 and 220 feet 
below the lowest Strophomena planumbona layer, Whiteavesia 
pholadiformis and a form resembling Modiolopsis concentrica, 
occur loose in strata which evidently were derived from this in- 
terval. Loose fragments of rock containing Catazyga occur at 
various intervals between 77 and 533 feet below the lowest Stro- 
phomena planumbona horizon, but in this interval Catazyga is 
very rare. 
At the 533-foot level, Catazyga occurs associated with Proetus, 
this being the highest level for that trilobite, at this locality, but 
the Catazyga is not abundant until a level 580 feet below the lowest 
Strophomena planumbona is reached. At the 820-foot level, the 
first specimens of Leptaena, belonging to the rhomboidalis group, 
are seen, in descending order. Between the 580 and 820-foot 
levels, Catazyga occurs at numerous horizons, but is common only 
at the 650, 693, and 710-foot levels. Proetus occurs at numerous 
levels between the 533 and 820-foot zones. It is with this part 
of the Nicolet River section that the Chambly village exposures 
are correlated, while those exposures which contain Whiteavesia 
pholadiformis and the form resembling Modiolopsis concentrica, 
in the absence of Proetus, are correlated with that part of the 
Nicolet River section which lies between the 77 and 220-foot levels. 
The exposures along the road, half a mile south of the station at 
St. Hilaire, probably belong here. 
