Contents. 



Page 



I. Introduction l 



a. The Material collected, and its preservation r 



b. The characters adopted for diagnosis 2 



II. Systematic ° 



a. Species captured by the Siboga Expedition 6 



Table of captures 2 ° 



b. Alleged differences between European and Indo-pacific specimens of the same species 29 



c. Notes on some species not captured by the Siboga Expedition 30 



d. Synonymic List of species 35 



III. Faunistic 42 



a. Distribution of species within the area of the Expedition 42 



1. Horizontal distribution 4 2 



2. Diurnal and nocturnal oscillation 43 



3. Vertical Distribution 43 



/;. Comparison with the epiplanktonic fauna of Japan and of the Maldive Archipelago 45 



c. On the geographical distribution of Chaetognatha 46 



1. Records of distribution 49 



2. Summary and conclusions "7 



IV. List of Literature ' 8o 



V. Index S6 



Explanation of Plates. 



