140 Vniversitij of CalifoDtia Puhlications in Zoology. [Vol.8 



tions of the data obtained by them. Furthermore, the surface 

 collecting with respect to season was so irregular and fragmen- 

 tary that the meaning of the data is very obscure. Six hauls were 

 made during each of the months of February, April, and Septem- 

 ber, 7 during November, 15 during March, 42 during July, and 

 53 during June. During August only one haul was made, and 

 during January, INIay, October, and December none were made. 

 In the following table the data for each month during which 

 collections were made are given. 



TABLE 51 

 Monthly Variation in Distribution of S. bipuiictata. 



It is evident from this table that the hauls were too unevenly 

 distributed with respect to temperature, salinity, and especially 

 time of day, to permit any significant comparison of the abund- 

 ance and frequency of the species during the various months. 

 Except for one November haul made between 8 and 10 a.m., 

 which obtained 1240 specimens, the largest number obtained in 

 any one haul during this month was 135. This indicates that 

 the November abundance of 424 is too large to represent the 

 usual abundance during this month. With this exception the 

 months of June and July are apparently those of maximum 

 abundance, although this appearance may be entirely due to the 

 greater number of tM'ilight hauls made during these months. 

 Until more collecting is accomplished with respect to season it 

 will be impossible to determine its effect on the distribution of 

 this species. 



