  We present a supplement to the Macquarie/AAO/Strasbourg H$\alpha$ planetary
nebulae (PNe) catalogue (MASH), which we denote MASH-II. The supplement
consists of over 300 true, likely and possible new Galactic PNe found after
re-examination of the entire AAO/UKST H$\alpha$ survey of the southern Galactic
Plane in digital form. We have spectroscopically confirmed over 240 of these
new candidates as bona-fide PNe and we include other high quality candidates
awaiting spectroscopic confirmation as possible PNe. These latest discoveries
largely comprise two distinct groups: small, star-like or moderately resolved
PNe at one end and mostly large, extremely low surface brightness PNe at the
other. Neither group were easy to discover from simple visual scrutiny of the
original survey exposures as for MASH but were relatively straightforward to
uncover from the digital images via application of semi-automated discovery
techniques. We suspect the few PNe still hidden in the H$\alpha$ survey will
lie outside our search criteria or be difficult to find.
