154 Scientific Intelligence. 
which was comune paper ce me lower part of the ice, then the 
kame-gravel began to gather the bottoms of their channels. 
Several of these 5 AS a ss -were a hundred or more miles long, as 
is shown by my map of the kames of Maine, published in the | 
Proceedings of the Association for 1880. Most of the kame-rivers 
have been described by me as probably sowing: in soanoole formed 
superficially on the ice, and that is my opinion still. 
coast these channels may originally nies been of sub-glacial origin. 
Northward there was a region where the drainage of the glacier 
was chiefly by surface channels which finally found their way ie 
neath the ice at the southern limit of this region. The final melt- 
ing of the great glacier took place largely at the surface, and this 
melting, together with the large rainfall, caused great "podies of 
formed sub-glacial channels fora part of their course, widening 
them until the ice-arch collapsed by its own weight. 
e may grant as great a development of sub-glacial streams in 
the ice-sheet as an one can reasonably consider is demanded 
the Greenland glaciers, and yet I cannot see how this "farnishes 
and also when the ice-flow had so far ceased as to make it ores 
above reasoning applies to Maine ouly. and other regions 
re to be studied by ineaealves, art of the reasoning will 
probably apply to most or all of the glaciated area of North 
rica, but with many differences in details, 
otes on Tertiary Shells; "by Orro Mares (Proc. Nat. Sci. 
Philad., 1884, p. Os) Me er, who is well versed in the 
onr. with Pleurotoma Volgeri Phil., of esi the same er 
range ve road; Saxicava bil ene Conr. with Saxicava aretica 
L., of wide distribution, and now living on both sides of the 
Atlantic; and confirms ’Heilprin’ is identification of Pleurotoma 
Fee So eS ee tan 
