Armina magna Baba, 1955 (original description)
Armina paucifoliata Baba, 1955 (original description)
Branchophyllum orientale var. sagamiense Baba, 1955 accepted as Polybranchia sagamiensis (Baba, 1955) (original description)
Cratena nigricolora Baba, 1955 accepted as Catriona nigricolora (Baba, 1955) (original description)
Cratena puellula Baba, 1955 accepted as Cuthona puellula (Baba, 1955) (original description)
Doto albida Baba, 1955 (original description)
Elysia abei Baba, 1955 (original description)
Elysia amakusana Baba, 1955 (original description)
Elysia atroviridis Baba, 1955 (original description)
Elysia hirasei Baba, 1955 (original description)
Elysia macnaei Ev. Marcus, 1980 (additional source)
Elysia sugashimae Baba, 1955 (original description)
Favorinus mirabilis Baba, 1955 (original description)
Nembrotha sagamiana Baba, 1955 accepted as Tambja sagamiana (Baba, 1955) (original description)
Placida babai Ev. Marcus, 1982 (additional source)
Protaeolidiella Baba, 1955 (original description)
Protaeolidiella atra Baba, 1955 (original description)

Japan for Branchophyllum orientale var. sagamiense Baba, 1955 
Sagami Bay for Favorinus mirabilis Baba, 1955