218 Sir W. £. Logan on the Fauna of the Quebec Rocks. 
ArGeulhta; ao. 68 066s PARE BE RE 36 species. 
Molden. 465 bees). coal. taeel idan sawes 56. = 
RGDLOUGM, 5.55 Gia dle + sais Od wi cos ee Ce 482. 4 
MOEN Ss dp dence é six cea xe oe Ce 4.55 
137 
Of this fauna not one species is found in the Anticosti group, 
where we have a gradual passage from the fauna of the Hud 
River formation to that of the Clinton, and not one of any forma- 
tion higher than the Chazy. Mr. Billings recognizes one species, 
Maclurea Atlantica (Billings) as belonging to the Chazy, and six 
species as belonging to the Calciferous. They are Lingula Man- 
telli (Billings), Camerella undescribed, Ecculiomphalus unde- 
scribed, Helicotoma wniangulata (Hall), H. perstriata. (Billings), 
and one remarkable species of an undetermined genus, like a 
very convex Cyrtodonta, which occurs both at Mingan and point 
Levi. All of the forms, particularly the trilobites, remind the 
observer of those figured by Dr. D. Dale Owen from the oldest 
From the physical structure alone no person would suspect 
the break that must exist in the neighborhood of Quebec, and 
from Lake Champlain. From this it proceeds in a gently CUT 
ing line to Quebec, keeping just north of the fortress; thence it . 
