III. Faunistic. 



a. DISTRIBUTION OF SPECIES WITHIN THE AREA OF THE EXPEDITION. 



I. Horizontal distribution. 



a. As the result of plotting the various captures on the track-chart, no evidence was 

 obtained that any species was confined to a particular district, nor that any district was poorer 

 in species than another. In other words, the Chaetognath fauna was approximately evenly 

 distributed in the various seas traversed by the Expedition (Celebes Sea, Banda Sea, etc.). 



p. For the consideration of another question, namely, the effect of the neighbourhood 

 of land upon the fauna, all hauls 1 ) containing Chaetognaths were divided into three groups: 

 42 neritic hauls, made in harbour or close to land; 20 hauls fairly close to land, but over 

 deep water; and 9 'oceanic' hauls made at a distance of more than 40 miles from land. But 

 really 'oceanic' conditions, which include entire independence of the effects of land drainage, 

 are hardly possible in an archipelago (this point will be discussed below). 



The number of occurences of each epiplanktonic species in each of the three groups 

 was then calculated as a percentage of the total hauls in that group, and yielded the figures 

 in the table following : 





Bedoti 



ENFLATA 



l'EROX 



HEXAPTERA 



NEGLECTA 



PULCHRA 



REGULARIS 



ROBUSTA 



SERRATODENTATA 



PACIFICA 



DKACO 



Neritic 



88 



IOO 



76 



54 



76 



6l 



I I 



64 



71 



47 



52 



Near land in 

























deep water 



75 



95 



70 



55 



50 



40 



10 



55 



90 



35 



65 



'Oceanic' 



66 



IOO 



55 



44 



55 



O 



33 



55 



IOO 



55 



22 



The conclusion to be drawn from this table is that all these epiplanktonic species were 

 fairly evenly distributed over the entire area investigated, irrespective of the distance from 

 shore (never very great), with the apparent exception of pulchra which failed entirely at the 

 9 'oceanic' stations more than 40 miles from land. 



1) Excluding 107 (dredge); 35, 175, 208, 210' (trawl); 216 (mesoplankton net); and 142 (2) in which most of the material 

 was rotten and unidentifiable. 



