44 



DISCOVERY REPORTS 



250-100 m. depth 

 500-250 

 750-500 

 1000-750 ,, 



increased. The following percentages represent the average of analyses of the five 

 stations: 129, 133, 137, 138 and WS 36: 



69 per cent with chromatophores 



19 " >> " 



4*5 " " " 



0'5 " " " 



In the single instance of a sample being taken from 2000-1000 m. (St. 138), as many 

 as 28,000 were taken and only 1 per cent possessed chromatophores. 



The depth distribution of Coscinodiscas, largely C. bouvet, as shown by N 70 V net 

 samples at stations exceeding 100 m. in depth is shown in Table I. The months in 

 which the stations were taken, November to February, are indicated at the head of each 

 column. 



Table I. Depth distribution of Coscinodiscus, largely C. bouvet, as shown by 

 N 70 V net samples at stations exceeding 100 m. in depth 



The footnotes refer to the ranges of depth of the lowest nets whenever shallow water prevented the standard range being obtained. 



e = 230-100 h = 130-100 k= 140-100 n = 170-100 9 = 224-100 



/= 180-100 7 = 310-250 7=170-100 0=171-100 r = 225-100 



170-125 0=600-500 7=175-100 m = 200-100 p— 150-100 s = 225-100 



a = 150-110 

 b = 160-100 



