Genus Ptychosyrinx Thiele, 1925

* Ptychosyrinx timorensis (Tesch, 1915) (Pl. 2, fig. 7)

Pleurotoma (s. str.) timorensis Tesch, 1915: 27, pl. 77 (5), figs. 52, 53. Ptychosyrinx timorensis teschi Powell, 1964: 291, pl. 223, figs. 5, 6. Gemmula (Ptychosyrinx) teschi .— Sysoev 1996: 17, figs. 68–70.

Material examined. ECS. 2 spms, CN KY9B-, 29°10’N, 127°30’E, silty mud, 1070 m, AT, 4. VIII. 1981; 1 spm, CN Ky8B-68, 27 °30’N, 128°10’E, silty mud, 900 m, AT, 3. VIII. 1981. Measurements (mm).

Distribution. East China Sea; Indonesia, Celebes, Moluccas and Borneo.

Remarks. Powell (1964) reported this form as a subspecies of Ptychosyrinx timorenis (Tesch, 1915) . The present specimens agree well with Powell’s (1964) descriptions. Sysoev (1996) raised it as a separated species distinct from P. timorenis because it has a much broader fusiform shell than that of P. t i m o re n i s and treated the Ptychosyrinx as a subgenus of Gemmula . He also mentioned that G. t e s c h i varies in the prominence of the spiral ribs on the shell base and the number of peripheral tubercles. Robba et al. (1989) synonymized Ptychosyrinx timorensis teschi Powell, 1964 as a junior synonym of Ptychosyrinx timorensis (Tesch, 1915) . We followed the opinion of Robba et al. (1989) here.