Catalexis – The unstressed syllable (or syllables) beginning an iambic (or anapestic) verse may be omitted; similarly the unstressed syllable (or syllables) at the end of a trochaic (or dactylic) verse. The verse is said to be catalectic .
^ Who would be
A mer man bold ,
^ Sit ting a lone ,
^ Sing ing a lone ,
^ Un der the sea .
Characteristic Effects of Various Feet and Metrical Variations
1. Anapestic and dactylic lines, containing as they do a large proportion of unaccented syllables, have a lighter and more rapid movement than iambic and trochaic lines. Hence, they are suited to fervid emotion, quick action, flowing melody.