  We observed the near infrared emission in the wavelength range 2.28-2.50
micron from the peculiar B[e]-star MWC349. The spectra contain besides the
strong IR continuum the first overtone CO bands and most of the hydrogen
recombination lines of the Pfund series, both in emission. We also modeled the
spectra. The Pfund lines have a gaussian profile with a FWHM of ~100 km/s, and
it turned out that their emission is in LTE and optically thin. To explain the
CO bands, several scenarios were investigated. We found that the CO band heads
are formed under LTE and that the gas must have a temperature of 3500 to 4000
K. The width of the 2 -> 0 band head indicates kinematical broadening of 50 to
60 km/s. We can obtain fits to the measured spectra assuming that the CO gas
has a column density of 5 10^{20} cm^{-2} and is located either at the inner
edge of the rotating circumstellar disk. In this case, the disk must have a
bulge which partly blocks the radiation so that the observer sees only a sector
on the far side where the radial velocities are small. Or the CO emission
originates in a wind with gaussian line profiles. Both fits are of equal
quality and satisfactory. In a third alternative where the fit is less
convincing, the CO emission is optically thin and comes from an extended
Keplerian disk.
