SEA-FISHERIES LABORATORY. 277 



much, greater numbers obtained by the shear net may be 

 due not wholly to tlie size of the net and mesh but in part 

 to the depth at which it wa^ worked. 



We give the following list as examples to show the 

 difference in numbers of Sagitta caught by the surface 

 (0 fathoms) and the weighted (10 fathoms) nets : — 







10 







10 







10 







1Q 







10 



faths. 



faths. 



faths. 



faths. 



faths. 



faths. 



faths. 



faths. 



faths. 



faths 



6 . 



.. 20 



1 .. 



. 30 



1 



.. 16 



6 . 



.. 22 



2 .. 



27 



1 . 



.. 6 



3 .. 



. 11 



4 



.. 28 



15 . 



.. 85 



24 .. 



125 



1 . 



.. 8 



12 .. 



. 27 



1 



.. 200 



3 . 



.. 17 



. — 



— 



. 



.. 24 



2 



. 40 



1 



.. 28 



4 . 



.. 240 



— .. 



— 



2 . 



.. 10 



2 '.'. 



. 23 



2 



.. 62 



4 . 



.. 30 



— .. 



— 



We have occasional evidence from the closing nets 

 that Sagitta is even more abundant in deeper water still. 

 For example, on April 9th, at Station II, the surface net 

 took one specimen, the weighted net at ten fathoms took 

 eight, and the JNansen net, which had been worked 

 through twenty to ten fathoms, took ten. On the other 

 hand, we have a few cases in which Sagitta was more 

 abundant on the surface, e.g., on September 9th, the 

 weighted net at ten fathoms took eight, and the two 

 surface nets took 25 and 86 respectively. As another 

 example of the results obtained with different nets we 

 quote the figures from September 19th, as follows : — the 

 surface nets took two and six, the Hensen (hauled up 

 vertically through twenty fathoms) two, the Nansen 

 (vertical, twenty fathoms) one, the weighted net (ranging 

 to ten fathoms) 126, and the shear net (about ten fathoms) 

 1.020 specimens. 



Other Larval Forms in Bay. 



Echinoderm larvae, Molluscan larvae and the Zoea 

 and Megalopa stages of crabs and some other larval forms 

 are sporadic in their occurrence. They are only caught 

 in abundance on rare occasions, and this is of course a 



