The Mollusca enumerated in this paper, have been collected by Dr. L. F. de Beaufort during his stay in our colonies; the majority is from Waigeu. No new species have been named, as the few specimens which are probably new, are in young or in poor condition, but some varietal names have been applied to forms which differ from the types by shape, or which, as for instance in Xesta aulica Pfr. have not been designed by names, as has been done for X. citrina Lin. many years ago, by E. von Martens. I have to thank Mr. G. K. Gude for assistance in naming some doubtful specimens and a few other authorities for the same or for loan of specimens. The few marine species have no special interest.