The Utica Terrane in Canada. 248 
It would thus appear that all the known Canadian species 
of Triarthrus possess this tubercle on the occipital segment, 
viz.: T. Canadensis, Smith; T. Becki, Green; T. Fischeri, 
Billings; 7. glaber and T. spinosus, Billings and T. Billingsi, 
Barrande. 
It was from the Lake St. John district that the Utica slate 
graptolites: Graptolithus flaccidus, Graptolithus quadrimu- 
cronatus, and fReteograptus ? Eucharis, were described by 
Hall in 1865, ‘‘ Canadian Organic Remains,” decade IL., pp. 
143-147 (supplement.) The precise locality given is Blue 
Point, Lake St. John. 
A peculiar organism occurs in the collection made by Dr. 
Selwyn, whose affinities are still doubtful. In some re- 
spects it has the character and structure of Megalograptus 
(Miller), and in others of a peculiar crustacean type. 
Further collections may afford better examples of this form 
whose affinities still remain unknown. 
THE OrtrawaA OUTLIER. 
In the Ottawa Paleozoic Basin the Utica terrane is fairly 
well developed, and-numerous as well as interesting ex- 
posures may be seen, especially in the vicinity of Ottawa 
city. In the townships of Plantagenet and Alfred two 
outliers of the Utica are recorded by Sir William Logan, 
No fossil remains have been seen from these outliers by the 
writer, but the Utica terrane about Ottawa has afforded 
him an excellent opportunity of studying its character 
and facies, as the outcrops are numerous and varied. Be- 
sides the natural exposures along the banks of the Rideau 
River, from the village of New Edinburgh up to near Bil- 
lings’ Bridge, along the Montreal Road and by the Beech- 
wood Cemetery, as well as underlying almost the whole of 
Centre and Upper Town west of the canal and south of 
Sparks Street, with a slight dislocation along Bank Street, 
which brings the Utica shales in front of the Supreme Court 
buildings, and south of Rochesterville, as already cited, the 
Utica was examined by the writer along numerous pits and 
in excavations made by the city engineer or contractors of 
(ae et 
