Marcou.] 
210 
[jan. 21, 
one yard in diameter, is seen (1863) at a height of about thirty- 
five feet above the street, inclosed in the slates, just as if it had 
been placed there in a sort of niche, or framed into the wall of 
black slates. At first it looks like a limestone boulder perched in 
a slaty cavity. 
Between the foot of the escarpment at the “C6te de la N6- 
gresse” to the “rue Champlain” at the north-west corner of the 
citadel, the strata has a thickness of at least 3,000 feet, which 
added to the 2,500 or 3,000 feet of slates existing between the St. 
Charles river and Trdsplat at Charlebourg, gives a total of 6,000 
feet, at least, for the Upper Taconic, in the city of Quebec and 
its vicinity. The fossils are very scarce. It is not like the 
Champlain system at Montmorency, Beauport, Tr&splat of Char- 
lebourg, Indian Lorette and St. Ambroise, where fossils are very 
abundant, and are found without any interruption in following 
the strata horizontally. After many years of researches, only 
five very limited spots in the plain and “Cdte d’ Abraham” have 
been found, containing a few fossils. Messrs. Ami and Giroux 
who made the discovery of those fossils, give the following list 
(See, on the geographical map accompanying this paper, the five 
spots, marked by a small cross.) Between the Grand allee and 
the Drill shed, eight graptolites ; between St. John market and 
St. Patrick street nine graptolites, three Lingula undescribed and 
special to those strata, Obolella , Acrothale , StricMandinia , n. 
sp., Ortliis , Leptaena n. sp. Leptaena sericea? Cyrtolites , Illaenus 
n. sp., Ampyx , n. sp. Trinucleus, n. sp., Cheirurus ? Asaphus? 
n. sp., Batliyurus ? Hydrocephalus or a new genus, Cyphaspis? n. 
sp., Beyrichia? and Primitia, all new species or doubtful ones. 
At “Cdte d’ Abraham” several monticuliporids, an Ortliis , a Lep- 
taena sericea , and portions of pleura of a species of Asaphus? 
(Loc. cit. pp. 77-80, K). 
Such an imperfect and limited fauna does not allow the conclu- 
sion given by the geographical survey of Canada, that the Quebec 
citadel series of strata belongs to the Trenton-Utica and more spec- 
ially the lower portion of the Utica slates ; but simply that we 
have there primordial forms mixed with very few second fauna 
forms. Lingula , Obolella , Acrothele , Ortliis , Batliyurus, Primitia, 
are all characteristic forms of the “Lingula flags” of Wales and 
of the Phillipsburgh and Pointe-L6vis group of Canada and Ver- 
mont. As to the Leptaena, Illaenus, Ampyx, Trinucleus, Cheir- 
