APP. IV] THE ACCURACY OF THE OBSERVATIONS 309 



(2) Details of the catches made during the German 

 periodic North Sea cruises. The following figures are taken from 

 Apstein's report in the Wiss. Meeresunt. Bd. ix. Abth. Kiel, 1906. 



North Sea, 1903. (Figures in brackets indicate the stations.) 



BIDDULPHIA spp. 



February: (1) 16,000, (2) 320,000, (3) 48,000. 



May: (1) 880, (2) 8000, (3) 0, (4) 0, (5) 80, (6) 20,000, 

 (7) 3100, (8) 24,000, (9) 60,000, (10) 20,000, (11) 0, (12) 0, 



(13) 0, (14) 0, (15) 0. 

 August: (1) 60,000, (2—15) 0. 



November : (1) 160,000, (2) 16,000, (3) 0, (4) 400, (5) 0, (6) 234,000, 



(7) 848,000, (8) 1,053,000, (15) 91,840,000. 



COSCINODISCUS spp. 



February: (1) 203,900, (2) 132,000, (3) 120,000. 



May: (1) 36,000, (2) 4800, (3) 13,440, (4)614,000, (5) 187,000, 

 (6) 149,600, (7) 161,100, (8) 54,400, (9) 256,400, (10) 152,880, 

 (11) 90,400, (12) 57,200, (13) 10,040, (14) 11,800, (15) 169,920. 



August: (1) 5600, (2) 3400, (3) 400, (4) 4400, (5) 16,900, 

 (6) 24,320, (8) 26,400, (9) 64,000, (11) 128,000, (12) 0, (13) 4000, 



(14) 2160, (15) 66,080. 



November: (1) 27,000, (2) 12,080, (3) 91,200, (4) 9540, 

 (5) 21,600, (6) 468,300, (7) 971,200, (8) 854,000, (15) 1,280,000. 



CHAETOCEROS spp. 



February: (1) 7,200, (2) 1,336,000, (3) 2,566,400. 



May: (1) 518,400, (2) 32,000, (3) 520,800, (4) 4,000,000, 

 (5)4,876,000, (6) 4,548,000, (7) 1,012,000, (8) 627,000, (9) 11,304,000, 

 (10) 3,756,000, (11) 157,977,000, (12) 10,020,000, (13) 24,000, 



(14) 144,000, (15) 248,000. 



August: (1) 400,000, (3) 40,000, (4) 0, (4a) 0, (5) 48,000, (6) 0, 



(8) 0, (9) 724,800, (11) 2,760,000, (12) 0, (13) 1,424,000, (14) 784,000, 



(15) 18,400,000. 



November: (1) 733,000, (2) 2,060,000, (3) 559,200, (4) 26,000, 

 (5) 252,000, (6) 429,680,000, (7) 384,240,000, (8) 443,830,000 

 (15) 1,760,000. 



CERATIUM spp. 



February: (1) 880,000, (2) 368,000, (3) 2,960,000. 



