1910 [4], 48 p., 14 figs, 1 plate, roy. 4to, paperbound (without covers). Small round blind-stamp on lower margin title-page. All published for the Actiniaria.From 1899 to 1900 the HMS "Siboga" explored the waters of the Dutch East Indies (now Indonesia), were an enormous collection of both shallow water and deep water organisms was gathered.