A species very similar to the amanda-carystia complex is Mathilda sinensis Fischer, 1867, from the China Sea (1867: 304, pi. 9 [erroneously referred to in text as "XI*], fig. 3). FISCHER did not indicate a holotype in his description and the originally figured syntype is here selected as lectotype (MNHN. Fig. 17). The lectotype (H = 5.8, D = 1.8, TW = 8,5+) shows the same general pattern of four major spiral ribs as does M. cf. amanda from New Caledonia, but differs in having more than 1.5 protoconch whorls as well as a more slender spire angle (16°). Mathilda telamonia Melvill, 1912, from the Persian Gulf is here synonymized with M. sinensis. MELVILL'S original description (1912: 246, pl. 12, fig. 12) did not indicate the number of specimens in the type series, nor did he designate a holotype. TREW'S (1987: 66) mention of a holotype (BMNH 1912.9.17.26) is here accepted as a lectotype designation in accordance with IGZN Article 74(b). The lectotype (H = 12.4, D = 3.1, PD = 520 µm;) matches the type dimensions of M. sinensis perfectly in having 8 1/2 teleconch whorls at a height of 5.8 mm.