Pathfinder Planar Binding creatures with more than 18 HD

[kevlar427]

My group and I are currently discussing what to do when planar bind creatures as per the spell: "Greater Planar Binding". Link here: http://www.d20pfsrd.com/magic/all-spells/p/planar-binding. The spell says that creatures cannot be summoned over 18 HD, however, it lists 3 creatures with more than 18 HD. Do we adjust the HD and lower stats and summon them anyway? If we can't, why are they listed in the spell if we can't summon them? I looked for someone with a similar problem but found no clear answer. Any help would be appreciated :)