In this paper we show that the Hilbert scheme H(3,g) of locally Cohen-
Macaulay curves in P-3 of degree three and genus g is connected. This
is achieved by giving a classification of these curves, determining th
e irreducible components of H(3,g), and giving certain specializations
to show connectedness. As a byproduct, we And that there are curves w
hich lie in the closure of each irreducible component.