[*] 55. The Nominative is always derived from the stem. The variety in form in the Nominative is due to simple modi fications of the stem, of which the most important are—
- Combination of final consonants: as of c (or g ) and s to form x; dux , ducis , stem duc-; rēx , rēgis , stem rēg-.
- Omission of a final consonant: as of a final nasal; leō , leōnis , stem leōn-; ōrātiō , ōrātiōnis , stem ōrātiōn-.
- Omission of a final vowel: as of final i; calcar , calcāris , stem calcāri-.
- Change of vowel in the final syllable : as of a toe; prīnceps (for -caps), prīncipis , stem prīncip- (for -cap-).