@book {5426, title = {Beobachtungen {\"u}ber Anatomie und Entwicklung einiger Wierbellosen Seethiere.}, year = {1851}, month = {1851}, pages = { - 4o, p 114, 117-118, 121-122 + Tab IV, X, XI}, address = {Berlin}, keywords = {Proporus viridis}, author = {Busch,W} }