Note on Balanus Hamer. 287 
in the basin on the final elevation of the land to the levels 
of to-day. 
That great fractures at or near the outcrops of the strata 
occasioned by the directions of the forces which elevated 
the strata, originated, in many instances, the deep bays and 
inlets which indent the Niagara and Hudson River escarp- 
ments and rocky coast lines of Lakes Michigan and Huron, 
these effects being afterwards supplemented by the action 
of waves, currents, atmospheric causes and probably local 
glaciers. 
That since the elevation of the land to the levels of to- 
day, the action of waves and currents on the clay cliffs and 
sand deposits has, in many places, greatly rounded off the 
general outlines of the coast, and the material from this and 
other sources has been spread over the lakes, or has served 
to create new features in the coast line elsewhere. 
NoTE ON BALANUS HAMERI IN THE PLEISTOCENE AT 
RIVIERE BEAUDETTE, AND ON THE OCCURRENCE 
OF PECULIAR VARIETIES OF MYA ARENARIA AND 
M. TRUNCATA IN THE MODERN SEA AND IN THE 
PLEISTOCENE. 
By Sr Wiui1aAm Dawson, LL.D., F.R.S. 
(1.) Balanus Hamon. 
The fine species of Balanus above named, which is still 
living in somewhat deep water on our coasts, was first de- 
scribed as a Pleistocene fossil of Canada by Sir C. Lyell, in 
his paper on “ Fossils and Recent Shells collected by Capt. 
sayfield.”' Bayfield found it in the Pleistocene at Beau- 
port, near Quebec. It was subsequently found by me in 
the Pleistocene at Riviere du Loup, St. Nicholas, and Mont- 
real.’ From the loose attachment of its radial plates, it is 
' Philos. Trans. 1859. 
*“ Notes on Post Pliocene of Canada.” Canad. Nat. 1872. 
