Final answer:
The poem 'The Raven' by Edgar Allan Poe predominantly features the use of internal rhyme and alliteration, which contribute to the poem's rhythmic and haunting quality.
Step-by-step explanation:
The excerpt from “The Raven” by Edgar Allan Poe makes extensive use of two particular structural devices: internal rhyme and alliteration. An internal rhyme occurs when a word in the middle of a line rhymes with the end word of that line or the end word of the next line. An example from the poem is “Eagerly I wished the morrow;- vainly I had sought to borrow.” Alliteration refers to the repetition of consonant sounds at the beginning of words that are close to each other in the text, as in “Doubting, dreaming dreams no mortal ever dared to dream before.” These devices enhance the rhythmic and sound quality of the poem, contributing to its haunting and melodic atmosphere.