The candidate cluster and protocluster catalog (CCPC) II:
  Spectroscopically identified structures spanning 2 < z < 6.6
  The Candidate Cluster and Protocluster Catalog (CCPC) is a list of objects at
redshifts z > 2 composed of galaxies with spectroscopically confirmed redshifts
that are coincident on the sky and in redshift. These protoclusters are
identified by searching for groups in volumes corresponding to the expected
size of the most massive protoclusters at these redshifts. In CCPC1 we
identified 43 candidate protoclusters among 14,000 galaxies between 2.74 < z <
3.71. Here we expand our search to more than 40,000 galaxies with spectroscopic
redshifts z > 2.00, resulting in an additional 173 candidate structures. The
most significant of these are 36 protoclusters with overdensities {\delta} > 7.
We also identify three large proto-supercluster candidates containing multiple
protoclusters at z = 2.3, 3.5 and z = 6.56. Eight candidates with N > 10 or
more galaxies are found at redshifts z > 4.0. The last system in the catalog is
the most distant spectroscopic protocluster candidate known to date at z =
6.56.
