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Conus tuberculatus (Yokoyama, 1920)
Conus tuberculosus (Tomlin, 1937)
Shell small, elongate-conic; spire elevated, acute, slightly concave when seen sideways; whorls seven to eight, shouldered; shoulders tuberculated, above which the surface is somewhat concave with fine spiral striæ and oblique lines of growth; on the body-whorl the tubercles are less distinel with the surface below it mostly smooth, the fine spiral grooves only appearing near the lower end. Aperture long and linear with the lower end some-what truncate (1).
The specimens are not rare, but all more or less water-worn, on which account the tubercles are often indistinet. Fig. 15 shows a worn specimen, 17 millim. in height and 8 millim. in diameter. Fig. 16. is a better preserved specimen, measuring 14 millim. by 7 millim (1).
The related species are Conus d' Orbignyi AUD. (TRYOX, Conch., vol. X, p. 75, pl. 23, fig. 96) from the Japanese and Chinese waters and Conus antidiluvianus BROC. (HÖRNES, Moll. Wiener-Beckens, p. 138, pl. V, fig. 2) from the European Neogene, from which, however, our fossil is readily distinguishable by its shorter spire (1).
Fossil occurrence. Miyata Zone (Kami-Miyata); Koshiba Zone (Koshiba) (1).
Two syntypes whereabouts unknown, (figs 17 x 8 & 14 x 7 mm).
Type locality Miyata Zone, Koshiba Zone, Miura Peninsula, Japan.
Nomenclatural status, an available name, an invalid name, a homonym of C. tuberculatus Dujardin, 1837 (fossil), renamed C. tuberculosus Tomlin, 1937.
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Bibliografia
(1) - Yokoyama, M., 1920. Journal of the College of Science, Tokyo Imperial University, 39
(2) - Tomlin, J. R. le B., 1937. Catalogue of Recent and Fossil Cones. Proceedings of the Malacological Society of London, 22 (pt. 4 ): 205 -330
(3) - Oyama, K. 1973 Revision of Matajiro Yokoyama's type Mollusca from the Tertiary and Quaternary of the Kanto area. Palaeontological Society of Japan, Special papers 17:1-148 + plates 1-57.
