  Single crystals of La(O,F)BiSSe were successfully grown by a CsCl flux
method. Single crystal X-ray structural analysis revealed that the crystal
structure is isostructural with BiS$_2$- or BiSe$_2$-based compounds with space
group $P4/nmm$ (lattice parameters $a$ = 4.1110(2) {\AA}, $c$ = 13.6010(7)
{\AA}). However, the S atoms are selectively occupied at the apical site of the
Bi-SSe pyramids in the superconducting layer. The single crystals show a
superconducting transition at 4.2 K in the magnetic susceptibility and
resistivity measurement. The superconducting anisotropic parameter is
determined to be 34 from its upper critical magnetic field. The anisotropy is
in the same range with that of other members of the La(O,F)BiCh$_2$ ($Ch$ = S,
Se) family under ambient pressure.
