Nembrotha Semper 1877

Semper 1877. Reisen im Archipel der Philippinen. II. Theil. Wissenschaftliche Resultate. II. Band. Malakologische Unteraschungen, 11 & 12 Hefte, by R. BERGH, pp. 429-546, pls. liv.-lxi. III. Band. Land-Mollusken, 4 Heft 1877: pp. 169-224