case FlutterlyzerGUI:
ItemStack equipped = getEquippedItem(player);
if (equipped == null)
return null;
return new GuiFlutterlyzer(player, new FlutterlyzerInventory(player, equipped));
case LepidopteristChestGUI:
return getNaturalistChestGui(ButterflyHelper.UID, player, world, x, y, z, guiData);
default: