84 NOTES ON THE HABITS OF CERTAIN CRAWFISH. 
Dr. Hagen mentions six specimens from Essex (Co.?) New 
Jersey, however, that were smaller than the above figures quoted 
from his work, being, to use his own words, ‘‘ Long. corp. 3 ad 4 
inch.” He thinks it quite possible that these may ‘‘ belong to a 
different species (viz., Cambarus Blandingii), a South Carolina 
form. : 
The young Cambari, in September, seem to be fully as active as 
the adults, but do not frequent any given class of localities, as 
they wander about the beds of streams, creeping forward in a 
slow, awkward manner, and swimming backwards, when disturbed, 
with wonderful rapidity. 
It has seemed curious to us, that we have found no dead speci- 
mens of crawfish. In what manner their unattractive bodies are 
disposed of after death we cannot imagine. We have tried, too, 
- in vain, to find out their enemies; but have failed to do so. We 
should judge that if at all preyed upon, it must be when they are 
but a few weeks old. But what becomes of their adult dead? 
Do they, as birds are asserted to do, seek some hidden nook? or 
do they dig their own graves deeply in the mud, preparatory to 
- the approaching dissolution, which they feel is near at hand? 
The precise number of species of this crustacean, inhabiting the 
streams of New Jersey, we do not doubt, will prove to be more 
than the three that we have mentioned; but as yet these are all 
that we can readily distinguish among the many dozens that we 
have gathered in our immediate neighborhood. The differences 
that mark these species, according to Dr. Hagen, are found to be 
ei with our separation of the specimens, in accordance 
th the different classes of localities where found; we can there- 
pm scarcely think that there is any error in asserting that the 
crawfish found in the neighborhood of Trenton, New Jersey, are 
respectively, Cambarus acutus, affinis and Bartonii; the first, a 
plant-loving species: the second, a deeper water, stone-haunting 
form ; the third, a burrower in the muddy banks of ditches, small 
streams and, occasionally, of the river itself. 
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