As Ullo Dah-Gow waddled into the section communications chamber on Yaradir, second planet of Zillor, two of his four walking tentacles stuck slightly on a nearly dry spot. "Fire and dry sand!" he swore at the technicians. "Can't you two even keep the footing decently moist?" Without waiting for an answer, he made his way to the row of shallow mud tubs before the television screen. The operators aimed eyestalks at each other. Finally, Yado Nol-Moz, as junior, rose and went to the wall controls of