Further, there are found here a large fissurella, and six species of a genus which, from its simple, unwound shell, would be immediately taken for a Patella; the creature, however, closely resembles the fissurella, with the difference that only one gill is visible in the fissure over the neck.
"A New Voyage Round the World, in the years 1823, 24, 25, and 26, Vol. 2"
Otto von Kotzebue
Among them were Fusus, Mytilus, Buccinum, fissurella, Patella, and Voluta, all found in the same numeric relations as those in which they now exist upon the beach below.
"Louis Agassiz: His Life and Correspondence"
Louis Agassiz
22. fissurella 120 World-wide-on rocks from low water to 5 fathoms.
"Sea-Weeds, Shells and Fossils"
Peter Gray B. B. Woodward