(Sakai, 1978)
The Japanese specimens are strikingly characterized by the gastric area in both male and female, very much convex and the hepatic area is also not flat but somewhat protruded near the base of the third antero-lateral tooth. The branchial areas are very thickly covered with granules, which sometimes form oblique or longitudinal rows. The gastric and cardiac areas are also thickly granulated. (Sakai, 1978)
Type locality: Hayama, Sagami Bay, Japan.
Range: Japan - Tokyo Bay (Ortmann, 1894a), Sagami Bay, off Mikawa and Tosa Bay (Sakai, 1965b), Tokyo Bay, Sagami Bay, off Mikawa Bay, Kii Minabe and Tosa Bay (Sakai, 1976a), Tosa Bay (Miyake, 1983), Suruga Bay (Takeda, 1997), Sagami Bay (Ng et al., 1998a, Ng & Manning, 1998); Taiwan - Tai-Chi, I-Lan County (Ng et al., 1998a, Ng & Manning, 1998); 80-1100 m.