Amaea ojiensis Yokoyama, 1927 † accepted as Amaea hedleyi (de Boury, 1912) (original description)
Cardium ebaranum Yokoyama, 1927 † accepted as Afrocardium richardi (Audouin, 1826) (original description)
Cyclostrema lamellata Yokoyama, 1927 accepted as Metalycaeus nipponensis (Reinhardt, 1877) (original description)
Eulima (Leiostraca) shibana Yokoyama, 1927 accepted as Melanella shibana (Yokoyama, 1927) (original description)
Kellia fujitaniana Yokoyama, 1927 † accepted as Tellimya fujitaniana (Yokoyama, 1927) (original description)
Kellia ojiana Yokoyama, 1927 † accepted as Alveinus ojianus (Yokoyama, 1927) (original description)
Kellia subelliptica Yokoyama, 1927 † (original description)
Litiopa simplex Yokoyama, 1927 † accepted as Diffalaba vitrea (G. B. Sowerby III, 1915) accepted as Alaba picta (A. Adams, 1861) (original description)
Martesia striata var. tokyoensis Yokoyama, 1927 accepted as Martesia striata (Linnaeus, 1758) (original description)
Meretrix gordonis Yokoyama, 1927 accepted as Microcirce dilecta (A. Gould, 1861) (original description)
Monilea ojiensis Yokoyama, 1927 † accepted as Umbonium giganteum (Lesson, 1832) (original description)
Montacuta crassa Yokoyama, 1927 † accepted as Eolepton crassum (Yokoyama, 1927) (original description)
Montacuta subtruncata Yokoyama, 1927 † accepted as Nipponomysella subtruncata (Yokoyama, 1927) (original description)
Odostomia (Besla) bicinctella Yokoyama, 1927 accepted as Besla bicinctella (Yokoyama, 1927) (original description)
Odostomia (Besla) sibana Yokoyama, 1927 accepted as Chrysallida sibana (Yokoyama, 1927) (original description)
Odostomia (Chrysallida) shibana Yokoyama, 1927 accepted as Parthenina shibana (Yokoyama, 1927) (original description)
Odostomia (Egilina) affectuosa Yokoyama, 1927 accepted as Parthenina affectuosa (Yokoyama, 1927) (original description)
Odostomia (Iolaea) amicalis Yokoyama, 1927 † accepted as Iolaea amicalis (Yokoyama, 1927) (original description)
Odostomia (Odostomia) fujitanii Yokoyama, 1927 accepted as Odostomia fujitanii Yokoyama, 1927 (original description)
Odostomia (Odostomia) optata Yokoyama, 1927 represented as Odostomia optata Yokoyama, 1927 (original description)
Philine ornatissima Yokoyama, 1927 accepted as Yokoyamaia ornatissima (Yokoyama, 1927) (original description)
Pyramidella (Syrnola) inturbida Yokoyama, 1927 † accepted as Puposyrnola inturbida (Yokoyama, 1927) (original description)
Pyramidella (Tiberia) ebarana Yokoyama, 1927 accepted as Tiberia ebarana (Yokoyama, 1927) (original description)
Rissoa paludinoides Yokoyama, 1927 † (original description)
Rissoina pagodula Yokoyama, 1927 accepted as Ebala pagodula (Yokoyama, 1927) (original description)
Rissoina yendoi Yokoyama, 1927 accepted as Pseudonoba yendoi (Yokoyama, 1927) (original description)
Scala lyra (G. B. Sowerby II, 1844) sensu Yokoyama, 1927 accepted as Epitonium yokoyamai K. Suzuki & Ichikawa, 1936 (original description)
Scala rissoinaeformis Yokoyama, 1927 accepted as Opalia matajiroi (Kuroda, 1954) (original description)
Solemya yamakawai Yokoyama, 1927 † accepted as Solemya japonica Dunker, 1882 (original description)
Tornatina fontinalis Yokoyama, 1927 accepted as Decorifer insignis (Pilsbry, 1904) (original description)
Turbonilla (Chemnitzia) edoensis Yokoyama, 1927 † represented as Turbonilla edoensis Yokoyama, 1927 † (original description)
Turbonilla (Chemnitzia) keiskeana Yokoyama, 1927 † represented as Turbonilla keiskeana Yokoyama, 1927 † (original description)
Turbonilla (Mormula) semicolorata Yokoyama, 1927 † represented as Turbonilla semicolorata Yokoyama, 1927 † (original description)
Turbonilla (Pyrgisculus) shigeyasui Yokoyama, 1927 accepted as Pyrgulina shigeyasui (Yokoyama, 1927) (original description)
Turbonilla (Pyrgolampros) subplanicostata Yokoyama, 1927 represented as Turbonilla subplanicostata Yokoyama, 1927 (original description)

Japan for Pyramidella (Syrnola) inturbida Yokoyama, 1927 † 
Tokyo for Monilea ojiensis Yokoyama, 1927 † 

 Type locality

 for Cardium ebaranum Yokoyama, 1927 †

Japan, Honshu, Tokyo, Shinagawa, Upper Musashino. [Tokyo Formation, Upper Pleistocene] [details]