But I have sinuous shells of pearly hue...
Shake one, and it awakens; then apply
Its polished lips to your attentive ear,
And it remembers its august abodes,
And murmurs as the ocean murmurs there.

Gebir, Book I (1798). Compare: "Murmurings, whereby the monitor expressed/ Mysterious union with his native sea", William Wordsworth, The Excursion (1814), Book iv. Wordsworth's prompted Landor to comment, "Poor shell! that Wordsworth so pounded and flattened in his marsh it no longer had the hoarseness of a sea, but of a hospital", Walter Savage Landor, Letter to John Forster.