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We have discovered a molecular dome-like feature towards $355^{\circ} \leq l\leq 359^{\circ}$ and $0^{\circ} \leq b \leq 2^{\circ}$. The large velocitydispersions of 50--100 km s$^{-1}$ of this feature are much larger than thosein the Galactic disk and indicate that the feature is located in the Galacticcenter, probably within $\sim1$ kpc of Sgr A$^{*}$. The distribution has aprojected length of $\sim600$ pc and height of $\sim300$ pc from the Galacticdisk and shows a large-scale monotonic velocity gradient of $\sim130$ km s$^{-1}$ per $\sim600$ pc. The feature is also associated with HI gas having amore continuous spatial and velocity distribution than that of $^{12}$CO. Weinterpret the feature as a magnetically floated loop similar to loops 1 and 2and name it "loop 3". Loop 3 is similar to loops 1 and 2 in its height andlength but is different from loops 1 and 2 in that the inner part of loop 3 isfilled with molecular emission. We have identified two foot points at the bothends of loop 3. HI, $^{12}$CO and $^{13}$CO datasets were used to estimate thetotal mass and kinetic energy of loop 3 to be $\sim3.0 \times 10^{6} \Mo$ and$\sim1.7 \times 10^{52}$ ergs. The huge size, velocity dispersions and energyare consistent with the magnetic origin the Parker instability as in case ofloops 1 and 2 but is difficult to be explained by multiple stellar explosions.We argue that loop 3 is in an earlier evolutionary phase than loops 1 and 2based on the inner-filled morphology and the relative weakness of the footpoints. This discovery indicates that the western part of the nuclear gas diskof $\sim1$ kpc radius is dominated by the three well-developed magneticallyfloated loops and suggests that the dynamics of the nuclear gas disk isstrongly affected by the magnetic instabilities.

Discovery of Molecular Loop 3 in the Galactic Center: Evidence for a Positive-Velocity Magnetically Floated Loop towards $L=355^\circ-359^\circ$