We have identified several types of multi-spin membranes, and have shown that the mem- brane equations are conveniently reduced to auxiliary mechanical problems of generalized pendulum. Using the recently proposed Chern-Simons quiver dual theory, we have provided the candidate dual operators. The spectrum of global charges agrees well with the mem- brane data, and we believe our analysis already renders strong support on the conjecture proposed in Refs. [6, 7]. One can think of many avenues to expand from this work. We have identified the pendulum-like potentials in Table I, but have not tried the full analysis for the general case of nonvanishing a,b,c . One can use the techniques employed in Ref. [20] and obtain implicit relations between the various global charges. For the case of b = c = 0, one obtains a simple dispersion relation like Eq. (39). Relations like E $^{2}$− J 2 ∝ λ are very well known in the duality between N = 4 Yang-Mills and AdS$_{5}$ × S $^{5}$. First obtained from multi-spin strings [23], it is well established that the same relation is also derivable from integrable spin chains, see Refs. [9–11] for reviews. It will be very interesting to try to construct the hamiltonian of the dual spin chain model for AdS$_{4}$ × M 1 , 1 , 1 , which would have SU (3) × SU (2) symmetry. One can also look for different types of solutions, or explore different backgrounds. Mem- brane configurations analogous to giant magnons [22] and spiky strings [24] which might rotate also in AdS$_{4}$ are interesting subjects. For different backgrounds, we have several homogeneous Sasaki-Einstein manifolds whose Chern-Simons dual are recently proposed. Q 1 , 1 , 1 is a toric Sasaki-Einstein manifold which is U (1) fibration over S 2 × S 2 × S $^{2}$. V$_{5}$$_{,}$$_{2}$ is homogeneous but non-toric, and the relevant M2-brane theory has been investigated in Ref. [25]. We hope to report on these problems in the near future. This work was supported by a grant from the Kyung Hee University Post-Doctoral fel- lowship in 2009 (KHU-20090505). ACKNOWLEDGMENTS 17