  We investigate a class of N=4 quiver Chern-Simons theories and their gravity
duals. We define the group of fractional D3-brane charges in a type IIB brane
setup with taking account of D3-brane creation due to Hanany-Witten effect, and
confirm that it agrees with the 3-cycle homology of the dual geometry, which
describes the charges of fractional M2-branes, M5-branes wrapped on 3-cycles.
The relation between the fractional brane charge and the torsion of the
three-form potential field is partially established. We also discuss the
duality between baryonic operators in the Chern-Simons theories and M5-branes
wrapped on 5-cycles in the dual geometries. The degeneracy and the conformal
dimension of the operators are reproduced on the gravity side. We also comment
on the relation between wrapped M2-branes and monopole operators. The baryonic
operators we consider are not gauge invariant. We argue that the gauge
invariance cannot be imposed on all the operators corresponding to wrapped
M-branes in AdS4/CFT3 correspondence.
