  HI observations with the VLA of the late-type barred galaxy NGC 925 show
clear streaming motions along four spiral arms close to the minor axis. A
transition from inward streaming to outward streaming is found, presumably
marking the corotation resonance. The realm of inward streaming extends to very
large radii, corresponding to 1.3R25 and 1.7 bar radii deprojected. This
implies that most of the visible disk is inside corotation, although the HI
disk extends beyond, at least to 2R25. As a result, either the bar and the
spirals are rotating separately or the bar rotates very slowly compared to
early-type bars. There is apparently no inner Lindblad resonance because of the
slowly rising inner rotation curve, and there may be no outer Lindblad
resonance if the disk ends first.
