125. a. In neuter stems -εσ becomes -ος in the nominative, accusative, and vocative singular (§ 25); elsewhere -σ- is lost (§ 55.a and c), and concurrent vowels are contracted (§ 29). But the genitive plural -έων is οften left uncontracted. The dual is rare.
b. Stems in -ασ likewise lose -σ- and contract.
126. τὸ κέρας (horn, wing [of an army]), has the inflection of two stems, κερᾱτ- and κερασ-.
127. Proper names with stems in -εσ are nearly like the masculine of adjectives with stems in -εσ (§§ 151-154).
b. The forms in parenthesis appear in poetry.
c. Here belongs also