2000 年 59 巻 4 号 p. 277-292
A single new subgenus, Perspicioscala and 14 new species, Cycloscala spinosa, Kurodacira glans, Cirsotrema (Cirsotrema) amamiense, Cirsotrema (Elegantiscala) amplsum, Gyroscala (Circuloscala) watanabei, Amaea (Narvaliscala) kushimotensis, Claviscala nodulosa, Claviscala nagaii, Claviscala subulae, Epitonium (Parviscala) tenuipicturatum, Epitonium (Perspicioscala) ossium, Epitonium (Perspicioscala) nodai, Epitonium (Perspicioscala) kiyohimae and Alora kiiensis are descrided. Three substituted names, Amaea (Narvaliscala) percancellata, Epitonium (Epitonium) profundum and Epitonium (Parviscala) graciliconfusum are proposed for subcancellata, okezoko and confusa, respectively. These species are figured and described in detail.