
54 NATURAL HISTORY MISCELLANY. 

about six feet. Frequently the excavation makes a rather abrupt bend, 
in the form of an elbow, but I have often found it straight to the end. I 
believe the termination is a little higher than the entrance. The “nest 
was always in a sort of oven-shaped chamber, near the end, the bottom 
being a little lower than the floor of the tunnel.” I have never found any - 
elaborate nest, the eggs in a majority of cases lying on the bare earth. On 
two occasions, however, I have found a bed of broken fragments of craw- |. 
fish shells, and fish-bones; but never to my knowledge any sticks or © 
eri 
sexes incubate, as I have caught both male and female upon the eggs.— 
ROBERT RIDGEWAY. 

GEOLOGY. 
No other shells besides Unios were found, although a few others may 
yet be discovered. Very few other kinds are to be found in the river 
near there. e bones of the deer are common among the shells, the 
nari lways being split open. Pieces of the carapace and other 
bones of the fresh-water turtle were also found. Among the implements 
found by the slight excavation mentioned, are one hatchet of greenish 
hornblendie rock, some flint arrow-heads and sharp-edged flints, probably _ 
used for skinning animals, and fragments of crude pottery. Some frag- 
ments of the'latter bear evidence of having been bürnt in contact with 
mara * 
marrow 



