Hamatani, I. (1976) Preliminary account of a new species of Volvatella Pease, 1860, V. viridis sp.nov., found in the Caulerpan Microfauna in Japan (Opisthobranchia: Sacoglossa). Publications of the Seto Marine Biological Laboratory, 22(6): 371-376, Figs 1,2, Pl.6.