Extra-Morainic Drift iri New Jersey. — Wright. 207 
-of the supra-scapula, where it sends off a branch, the supra-scap- 
ular, which continues over that plate nearl}' in a straight line 
through its middle. Turning sharply, almost at a right angle, 
outward and forward, the occipital canal continues till it meets 
the marginal canal. This skirts the outer edge of the head from 
the hinder angle of the marginal plate to the post-orbital canal 
which it meets nearl}' in the centre of the plate of that name. 
Besides these, there are indications of another, beginning in the 
angle between the pre-orbital and post-orbital canals and running 
forward and outward along the line of external suture of these 
plates. Turning sharply outward, after a short course, it termi- 
nates at the edge of the hinder part of the orbit. This is less dis- 
tinct than the others in consequence of a possible confusion with 
the almost coincident pre-post-orl)ital suture. 
EXTRA-MORAINIC DRIFT IN NEW JERSEY. 
A. A. Wright, Oberlin, O. 
There is a snare in the words "terminal moraine" as applied 
to the great ice sheet of the Glacial Epoch. On the one hand 
there is not one terminal moraine, but many; a dozen perhaps, in 
retreating order, as urged liy Mr. Upham for INIinnesota, and as 
shown by the recent work of Mr. Leverett, in Ohio, and as illus- 
trated everywhere within the glaciated area. On the other hand, 
the ternnnal terminal moraine, that is to say, the southernmost, 
is not terminal for the ice sheet, in the sense of accurately mark- 
ing at ever}' point the utmost extension of the land ice. Another 
expression, based upon a different geological conception, is 
needed for this line; and the words "glacial boundary" have been 
widely used and accepted. The terminal moraine cannot go 
south of the glacial boundar\', ]>ut the glacial boundary ma}', and 
does often, lie many miles to the south of the terminal moraine. 
The area between the two lines, where they do not coincide, is 
marked with true signs of glaciation, and is covered with a thin- 
ner or thicker layer of transported material, which represents the 
work of the lobe of ice which once extended over it, but which 
was withdrawn l)efore it had formed a detinite boundary moraine. 
When we reflect that the Laurentide glacier was a fan-shaped 
sheet, radiating from a northern center, and not like the Swiss 
