310 THE ACCURACY OF THE OBSERVATIONS [APP. IV 



May: (1) 3,839,200, (2) 448,000, (3) 1,212,000, (4) 866,000, 

 (5) 2,385,200, (6) 6,706,000, (7) 6,768,480, (8) 2,476,000, (9) 8,338,000, 

 (10) 2,950,800, (11) 1,210,000, (12) 1,260,400, (13) 640,000, (14) 

 1,308,000, (15) 4,192,000. 



August: (1) 601,600, (3) 11,640,000, (4) 293,680, (4a) 1,480,000, 

 (5) 8,648,000, (6) 20,178,000, (8) 8,168,000, (9) 32,880,000, (11) 

 6,320,000, (12) 5,200,000, (13) 2,368,000, (14) 5,440,000, (15) 8,160,000. 



November : (1) 2,017,000, (2) 336,000, (3) 21,536,000, (4) 19,066,000, 

 (5) 12,044,000, (6) 21,498,000, (7) 15,536,000, (8) 14,719,000, 

 (15) 2,800,000. 



COPEPODS. 



February: (1) 336,960, (2) 96,160, (3) 213,300. 



May: (1) 488,680, (2) 489,720, (3) 598,780, (4) 654,800, 



(5) 523,520, (6) 629,580, (7) 546,320, (8) 697,680, (9) 713,580, 



(10)742,300, (11)908,560, (12)294,080, (13)135,680, (14) 205,280, 

 (15) 764,640. 



August: (1)381,600, (2)1,344,440, (3) 1,044,960, (4) 1,391,520, 

 (5) 442,560, (6) 742,960, (7) 620,820, (9) 4,232,000, (11) 697,440, 

 (12) 478,160, (13) 1,327,840, (14) 396,640, (15) 261,600. 



November: (1) 316,140, (2) 198,000, (3) 266,480, (4) 251,840, 

 (5) 182,520, (6) 471,120, (7) 566,000, (8) 682,560, (9) 1,545,600. 



(3) Hensen's Nordsee expedition of 1895 : details of the 

 catches. The results of this expedition are valuable, more because 

 they are illustrative of a method of research which promises to be of 

 service in practical fishery investigation, than because of the precise 

 deductions made by Hensen. I think it is now certain that the 

 enumeration of the various species of fish eggs was inaccurate. In 

 1895 the characters of the various species of teleostean eggs were not 

 known very exactly. The Kiel zoologists based their identifications of 

 the cod, flounder, plaice, whiting, dab and long rough dab mainly on 

 the diameters of the ova, and we know (see Heincke and Ehrenbaum, 

 Wiss. Meeresunt. Kiel Komm. Bd. iii. Abth. Helgoland, Helgoland, 

 1900; and Nordisches Plankton, Kiel and Leipzig, 1905) that in 

 certain cases the sizes of the eggs do not afford a very reliable means 

 of distinguishing between the species of some ova. The individual 

 catches of the cod eggs obtained are however of much interest as 

 indicating the limits of variability of distribution of fish eggs in the 



