Contents. 



Page 



I. Intioduction i 



a. The Mateiial collected, and its preservation i 



II. The characteis adopted for diagnosis 2 



II. Systematic 6 



a. Species captured by the Siboga Expedition 6 



Table of captures 28 



b. Alleged difTciences between Kuropean and Indo-pacific specimens of the same species 29 



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



(/. Synonymie List of species 35 



III. Faunistic 42 



a. Distribution of species wilhin the arca of the Expedition 42 



1. Horizontal distribution 42 



2. Diurnal and nocturnal oscillation 43 



3. Vertical Distribution 43 



/'. Comparison vvith the cpiplanktonic fauna of Japan and of the -Maldive .Archipelago 45 



<-. On the gcographical distribution of Chaetognatha 46 



1. Records of distribution 49 



2. Sununary and conclusions 67 



IV. I.ist of I.iteratiire So 



V. Index 86 



Explanation of Plates. 



54774 



