34 



THE AMERICAN NATURALIST [Vol. XLVII 



Sagitta HEXAPTEBA 

 Some indication of the relative abundance of this 

 remaining species of Sagitta may be gleaned from the 

 following table : 



TABLE VI 

 Eelative Abundance of Sagitta hexaptera 



50-100 88 

 100-150 none 

 150-350 none 



When to the evidence contained in this table we add 

 that the species was not obtained in hauls made with open 

 vertical nets from above 45 fathoms, the facts suggest 

 that S. hexaptera maintains its maximum abundance 

 between 50 and 100 fathoms. The number of specimens, 

 however, is too small to afford basis for any more positive 

 conclusion. 



Kbohnitta subtilis 

 Kegarding this species, we find that the horizontal clos- 

 ing nets obtained four specimens from 200 fathoms, but 

 none from above or below this depth. The vertical clos- 

 ing nets, on the other hand, obtained twelve from between 

 50 and 200 fathoms, 25 from between 200 and 250 fathoms, 

 and five from between 250 and 300 fathoms. Only three 

 were obtained by the open vertical nets and those in one 

 haul made from 250 fathoms to the surface. The follow- 

 ing table gives a more accurate idea of the relative abun- 

 dance of this species : 



TABLE VII 



Relative Abundance of Krohnitta subtili* Based on Vertical Closing 

 Net Catches 



200-250 63 

 250-300 20 



