"But liquidly glide on his ghastly flank ..."
See in text (Text of the Poem)
This line contains some notable examples of internal rhyme, both assonance—the repetition of vowel sounds—and consonance—the repetition of consonant sounds. The phrase “liquidly glide” recycles three l sounds and three i sounds, two soft and one hard. The phrase “ghastly flank” repeats l sounds and soft a sounds. It also connects the consonant pair g and k, g being a voiced k. Melville often experimented with musical and sonic effects in his writings, verse and prose alike.