Figure 1 in The balanced life: evolution of ventral shell weighting in gastropods

Figure 1. Examples of Recent gastropods with a ventral callus. All specimens are in the Vermeij collection. A, Monetarla caputserpentis Linnaeus, 1758 (Cypraeidae), reef off Nchesar, Babeldaob, Palau, collected 5 September 1975; cypraeiform callus. B, Cypraecassis testiculus Linnaeus, 1758 (Cassidae), grassbeds, Isla Galeta, Atlantic Panama, collected 12 April 1975; cassiform callus. C, Vasum rhinoceros Gmelin, 1791 (Vasidae), in grassbeds, Klkambala, Kenya, collected June 1972; modified cassiform callus. D, Gutturnium muriclnum Roding, 1798 (Cymatlidae), at depth of 4 m lying on its dorsal side, northeast coast of Urukthape1, Palau, collected 19 June 1984 by Roy K. Kropp; modified cassiform callus. E, Polinices mammilla Linnaeus, 1758 (Naticidae), Cocotiers beach, Nosy-Be, Madagascar, collected 29 June 1972; pseudoliviform callus. F, Phrontis luteostoma Broderip & Sowerby, 1829 (Nassariidae), Playa Venado, Pacific Panama, collected 28 August 1969; cassiform callus. G, Ministrombus variabilis Swainson, 1820 (Strombldae), depth of 12 m, Malakal, Palau, collected 9 July 1984 by Roy K. Kropp; modified cassiform callus. H, Nassarius pullus Linnaeus, 1758 (Nassariidae), grassbed, Taneti Island, Maluku, Indonesia, collected 12 July 1979; cassiform callus. I, Linnerita polita Linnaeus, 1758 (Neritidae), Tagachan Point, Guam, collected 26 May 1981; modified cassiform callus. Scale bar: 1 cm.