148 University of California Publications in Zoology. [Vol.8 



TABLE 56 



Day and Night Distribution of S. serratodentata based on Vertical Closing 



Net Hauls. 



Daylight or 6 a.m. to 6 p.m. 



Night or 6 p.m. to 6 a.m. 



While these data are not strictly comparable to those obtained 

 with horizontal nets, they show clearly that during daylight the 

 species is less numerous above 75 fathoms than it is during the 

 night. 



In the data concerning vertical closing net hauls one instance 

 is found where two similar series of hauls were made with the 

 same net on the same day at approximately the same location. 

 One series was made between 1:10 and 3:24 p.m. and the other 

 between 4 :20 and 7 :34 p.m. It will be interesting, therefore, to 

 compare the actual number of animals obtained from each depth 

 during the afternoon and evening series. Such data are given in 

 the following table. 



