. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO KNOWLEDGE OF MARINE MOLLUSCA 25 Remarks. See Sowerby (loc. cit. infra). Dall included fossil and Recent species, but Thiele restricted the genus to contain two Recent species only. Allied to the fossil Volutilithes Swainson 1840 (type f spinosa Lam.). Volutocorbis abyssicola (Ad. & Rve.) Figs. 7fa), 9(a) 1848. Adams & Reeve. £ool. Samarang. Moll., p. 25, pi. 7, fig. 6, juv. (Voluta a.). 1886. Watson. Rep. Challenger, xv, p. 258, pi. 15, fig. 1, adult (Voluta a.). 1889. S
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO KNOWLEDGE OF MARINE MOLLUSCA 25 Remarks. See Sowerby (loc. cit. infra). Dall included fossil and Recent species, but Thiele restricted the genus to contain two Recent species only. Allied to the fossil Volutilithes Swainson 1840 (type f spinosa Lam.). Volutocorbis abyssicola (Ad. & Rve.) Figs. 7fa), 9(a) 1848. Adams & Reeve. £ool. Samarang. Moll., p. 25, pi. 7, fig. 6, juv. (Voluta a.). 1886. Watson. Rep. Challenger, xv, p. 258, pi. 15, fig. 1, adult (Voluta a.). 1889. Studer. Forschungsreise Gazelle, iii, pp. 52, 55. 1900. Woodward. Proc. Mai. Soc, iv, p. 121, pi. 10, figs. 4-8, 10, 12 (anatomy). 1901. Smith, loc. cit., p. 235 (Volutilithes a.). 1902. Sowerby. Mar. Invest. S. ii, p. 97, pi. 2, fig. 6 (radula) (anatomy) (Volutilithes a.). 1903. Von Martens. D. Tie/see Exp., vii, p. 31 (Ternivoluta a.). 1903. Thiele. ibid., p. 170; pi. 9 (4), fig. 65 (radula). 1922. Cooke, loc. cit., p. 7 (radula). 1925. Thiele. D. Tie/see Exp., xvii, p. 200. Numerous fine axial ribs and spiral lirae forming a cancellate sculpture, with sharp points at the intersections, the first spiral lira with its points forming a narrow shoulder but not concealing the suture; intervals between 1st and 2nd lirae (sometimes between 2nd and 3rd) greater than intervals between the following lirae, forming a shallow groove a little distance below the suture; axial ribs 18-21 on 1st whorl, increasing to 60 or 70 (80 in largest specimen) on body whorl. Aperture 2f (juv. 14 mm.) decreasing to 2J or 2 times spire. Protoconch 2 (2 J) whorls, diam. 2 mm. Postnatal whorls 5. Columella pleats 1 in protoconch, 2 in 1st whorl, increasing to 10-12 in adult, but very variable in adults, some pleats being smaller intermediaries between pairs of larger pleats, being as Thiele stated (1925, p. 200) the spiral lirae of the previous whorl overlaid by callus; he regards only the 4 lowermo
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