1925-1931 Two parts in one. 62, 67 p., 45, 41 figs, 3 plates, roy. 4to, contemporary black cloth (paper label on spine) with green-brown marbled boards. Small round blind-stamp on lower margin title-page.A good, tightly bound copy of this work based on material collected by the most important Dutch marine biological expedition. 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. Scarce.