The account on West-Indian molluscs which I will give in the following pages, was started as a consequence of material, collected by Dr. J. BOEKE in the course of 1905, by Dr. C. J. VAN DER HORST during April and May of 1920 and by engineer G. J. H. MOLENGRAAFF since 1921. Besides I will mention species from Curaçao already present in the collections of the Zoological Museum at Amsterdam. The majority of these species were collected alive and all of them belong to the littoral zone stretching from high-water-mark to about one fathom.