Calagrassor hayashii (Shikama, 1971) Colus hayashii Shikama, 1971:31, pl. 3, figs 9, 10. TYPE MATERIAL - Holotype KPM NGX003866 (formerly NG0103866) (as listed below). TYPE LOCALITY - "From Ensyu-nada, about 100 f. deep" (Shikama, 1971:31), the holotype is labelled "Mikawa" (30 km S of Nagoya, central Japan). MATERIAL EXAMINED-Japan. Central Japan, S off Nagoya, 180 m, 1 dd (holotype KPM NGX003866; Figure 84). - SW Kagoshima Prefecture, 300 m, 1 dd, MC. - Okinawa, NE off Senkaku Islands, 200 m, 2 dd. China. East China Sea, on sunken wood, 280-380 m, 4 lv, KF-5244, 5187 (Figures 87,114). - 100-300 m, 3 dd, PS. Taiwan. TAIWAN 2000: stn FP38, 21°32'N, 120°48'E, depth unknown, 2 lv. - Donggang, around 22°12'N, 120°30'E, 150-200 m, local fishermen, taken by fishing vessel, on sunken wood.
DISTRIBUTION- Western Pacific, from Taiwan and China in the west to central Japan in the north-east; 180-300 m, alive in 200 and 280 m. The species appears to be associated with sunken wood. The specimen from South Taiwan Strait (SH) was collected on a piece of wood roughly two meters in length; syntopic with Nierstraszella lineata (Nierstrasz, 1905), Homalopoma tosaensis (Habe, 1953), Limalepeta lima (Dall, 1918), Pectinodonta orientalis Schepman, 1908, Cocculina nipponica Kuroda & Habe, 1949, and Dillwynella vitrea Hasegawa, 1997 (Shih I Huang, pers. comm.). Sympatric with Calagrassor sp. 3 in the East China Sea (on sunken wood).
REMARKS - Calagrassor hayashii comb. nov. is characterized by its broad, semi-oval shape and rather blunt apex, the comparatively numerous axial ribs on the upper spire whorls, the rather flattened spiral cords with narrow interspaces on the spire with moderately wide interspaces on the base, and the smooth periostracum. Calagrassor aldermenensis is very similar to C. hayashii but differs in its more slender shape and more conical spire with straight to weakly convex sides producing a sharper apex, the slightly fewer spiral cords (six on the penultimate whorl rather than seven), the slightly narrower spiral interspaces, the fewer axial ribs, especially on the upper spire whorls, and the slightly smaller adult size. Calagrassor pidginoides n. sp. has a similar number of axial ribs on the spire whorls to that of C. hayashii but differs in its wider spiral cords with narrower interspaces, the higher spire and the slightly larger adult size.