276 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



curve drawn from these numbers, showing the more 

 prominent humps in the height of summer and again in 

 October-November. Sagitta is present throughout the 

 year; it is most abundant in August, and the minimum 

 occurs in winter (January to March). 



We have not yet made a curve for the occurrence of 

 Sagitta outside the bay, but so far as an inspection of the 

 numbers shows the result would not differ materially 

 from that given above. Those nets that are comparable 

 give much the same run of numbers. As showing, 

 however, the difference produced by a larger net of wider 





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Fig. 13. 



mesh, we find that during April, when the hauls with the 

 ordinary tow-nets were giving units and tens, those taken 

 at the same time with the shear-net ran into hundreds, 

 as follows:— 360, 123, 286, 310, 200, 200, 400, 400, 300, 

 800, 60. The fact, however, that the weighted tow-net, 

 not invariably, but usually took a much larger number 

 than the similar surface nets shows that Sagitta is usually 

 more abundant in a zone of water below the surface, 

 extending down to ten fathoms, and that consequently the 



