The shells of species within this genus are very large and solid, with a tall
spire, a rounded
aperture, a broadly flanged outer lip, and a moderately long
siphonal canal, which is flexed and inclined to the left. The
varices are prominent and rounded, but are hollowed out on the inside.
Lamarck J.B. (1816). Liste des objets représentés dans les planches de cette livraison. In: Tableau encyclopédique et méthodique des trois règnes de la Nature. Mollusques et Polypes divers. Agasse, Paris. 16 pp.
Schumacher, C.F. 1817. Essai d'un Nouveau Systéme des Habitations des vers Testacés. Copenhagen : Schultz 287 pp., pls 1-22.
Dall, W.H. 1904. A historical and systematic review of the frog-shells and tritons. Smithsonian Miscellaneous Collections 47: 114-144
Iredale, T. 1917. More molluscan name-changes, generic and specific. Proceedings of the Malacological Society of London 12(6): 322-330
Rolán E., 2005. Malacological Fauna From The Cape Verde Archipelago. Part 1, Polyplacophora and Gastropoda.
Vaught, K.C.; Tucker Abbott, R.; Boss, K.J. (1989). A classification of the living Mollusca. American Malacologists: Melbourne. ISBN 0-915826-22-4. XII, 195 pp.
Further reading
R. Tucker Abbott & S. Peter Dance, 1982, Compendium of Seashells, Duttin,
New York