  We present the discovery of a new quadruply lensed quasar. The lens system,
SDSS J1330+1810 at z_s=1.393, was identified as a lens candidate from the
spectroscopic sample of the Sloan Digital Sky Survey. Optical and near-infrared
images clearly show four quasar images with a maximum image separation of
1.76", as well as a bright lensing galaxy. We measure a redshift of the lensing
galaxy of z_l=0.373 from absorption features in the spectrum. We find a
foreground group of galaxies at z=0.31 centred ~120" southwest of the lens
system. Simple mass models fit the data quite well, including the flux ratios
between images, although the lens galaxy appears to be ~1 mag brighter than
expected by the Faber-Jackson relation. Our mass modelling suggests that shear
from nearby structure is affecting the lens potential.
