LESSON 9 THE THIRD DECLENSION (CONTINUED) Rule 3—Some nouns ending in -ις and -ευς have a genitive ending with -εως instead of -ος. The two following should be memorized:— πόλις, a city (feminine) (stem πολι-) Singular Plural Nom. πόλις πόλεις (for πόλεες) Voc. πόλι πόλεις ( " ) Gen. πόλεως πόλεων Dat. πόλει πόλεσι Acc. πόλιν πόλεις (for πόλεας) (Note the accusative in -ιν; see note in Lesson 8) Like πόλις are δύναμις, power; κρίσις, judgment; ὄφις, a serpent,