222 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



half of the water, caught as usual more than either the 

 deep or the surface nets. We have much evidence of this 

 kind that the most populous zone in the sea is below the 

 surface but above ten fathoms. 



We print also Form 42 for comparison with Form 45. 

 The hauls were taken only three days apart hut at 

 different localities, Form 45 representing the along-shore 

 station IV, while Form 42 records a haul from off-shore 

 station II, nearly ten miles off. In 42, although the 

 amounts in the two surface nets are nearly the same, 15*5 

 and 16 c.c, still the quantities of the various organisms 

 present differ considerably in the two cases. Of some 

 few (e.g. Podon and Evadne) the numbers are alike, but 

 with other organisms (Biddul'phia and Coscinndiseiis) 

 twice as many are in the one net as in the other ; some 

 Copepoda show like numbers, others are in the proportion 

 of nearly ten to one. The Nansen net here, as usual, 

 catches more than the Hensen, and the weighted net with 

 its deeper range more than the otherwise similar surface 

 nets. It will be noticed that the shear-net got relatively 

 large numbers of the larger organisms, Pleiirobrachia* 

 Medusae, Sagitta, and the larger larvae. 



Form 42 is of interest also when compared with 41, 

 representing oif-shore station I, at practically the same 

 time (within an hour). They are clearly similar hauls 

 having the same general fades although all the numbers 

 differ in detail. 



The marked difference of 45 (the later date, April 

 22nd) to both 41 and 42 (April 19th) in the proportion of 

 Diatoms to Copepoda present is noteworthy. A glance 

 at the lists shows the disproportion, and the total 

 numbers are : — 



Form 41: Diatoms, 300,000; Copepoda, 22,985 

 ,, 42: „ 458,000; „ 20,218 



,, 45: ,, 1,450; ., 24,620 



