wow! it looks like that baby may have been dropped.
if its a clean break and you can put it back together perfectly, you may be able to glue it back together.
1: take off the hardware and put PL premium high strength wood glue inside of the crack. this stuff will not break under pressure or vibration, but will still allow the wood to expand and contract. lay the drum down in a secure position, line up everything perfectly then use clamps to hold it together but be careful not to warp the drum's shape. also, just after gluing and clamping, make sure no glue has spilled over onto the finish side. once you know its clean and lined up perfectly, put a strip of masking tape over the crack on the finish side to ensure everything stays together and no glue overflows. i would let that baby dry for 24 hours dude. just to be sure. afterwards, you can lightly sand the ecxess glue off of the inside of the drum. use 320 grit sandpaper LIGHTLY, dont rush sanding.
im sure others will have more ideas, but this was the only thing i could think of. hope this helps.