FIGURE 1 in Prestonellinae-validation of the name as a new subfamily of Bothriembryontidae (Mollusca, Gastropoda, Orthalicoidea)

FIGURE 1. Prestonella bowkeri (Sowerby, 1890), Glen Avon Falls, Somerset East, E. Cape, South Africa (KwaZulu-Natal Museum, V9816). A–C, shell, length 17.2 mm. D, entire genital tract. E, transverse section of penis showing vas deferens embedded beneath penis sheath. F, penis exposed by partial removal of penis sheath. Abbreviations: ag, albumen gland; bc, bursa copulatrix; bcd, bursa copulatrix duct; ep, epiphallus; f, flagellum; ga, genital atrium; hd, hermaphrodite duct; ot, ovotestis; p, penis; pl, penis lumen; pr, penial retractor muscle; ps, penis sheath; sod, sperm-oviduct; v, vagina; vd, vas deferens.