Published serialised monthly (bound in yearly volumes) but this is apparently not marked in the bound works (except at least some plates (all?) have a dated inscription). Treated as a journal in BHL. Treated as a book series here as by a single author. The content, which is a series of numbered plates with following commentary, can be referenced when linked to a species by the volume and by topic (eg entomology, conchology) with plate number
World Polychaeta Database (WPolyDb)