46 
fication of the appetites of these animals, then com- 
mon, but which now appear to us so extraordinary. 
2. Ripple-marks are seen in a number of these 
pieces; for example, on the slab first described, on 
the Brontozoum Sillimanium slab, on the Brontozoum 
Gracillimum slab, on one of the Triznopus, and on 
the upper surface of the Greenfield slab. These 
marks are represented by parallel curves, or straight 
lines, distant from each other from half an inch to 
an inch, and presenting a slight degree of prominence. 
There is another form of ripple-marks (?), differing 
from those above described. ‘These are of a circular 
and mammillary form: they are strewed thickly, like 
little islets, approximating to each other. They are 
seen distinctly on one of the slabs of the Brontozoum 
Sillimanium, on that of the A‘thyopus Lyellianus, 
and some others. Whether they are to.be considered 
as accumulations of sand and clay, formed by the 
action of the sea, we are uncertain; but there seems 
to be no other cause to which they can be assigned 
with so great probability. 
3. Coprolites, the fossilized ejections of animals, are 
intermixed with other animal vestiges in the sandstone 
of Connecticut River, and afford additional proof of 
the former existence of animals about these rocks. 
