References

Tryon GW. 1885. Testacellidae, Oleacinidae, Streptaxidae, Helicoidea, Vitrinidae, Limacidae, Arionidae. Pp. 1-364, 60 pl. In: GW Tryon, ed, Manual of Conchology, structural and systematic, with illustrations of the species. Second series. Philadelphia: Conchological Section of the Academy of Natural Sciences of Philadelphia.