. The Annals and magazine of natural history; zoology, botany, and geology. the locality, Anstruther andBuckie being the earliest. The e,^g of the herring is demersal, differing thus from thepelagic QQ^ of the sprat. The intraovarian development ofthe herring has been worked out by Kupffer and subsequentlyby Brook (3rd and 4th Ann. liep. S. F. B.). Eggs were obtained here on Feb. 5, 1S85, from Anstruther,and hatched out in the laboratory in twenty-five days. Newly hatched forms occurred on March 7, 1887, andlarval and post-larval forms in March and the beginning ofApril in 1887 and 1889. The p
. The Annals and magazine of natural history; zoology, botany, and geology. the locality, Anstruther andBuckie being the earliest. The e,^g of the herring is demersal, differing thus from thepelagic QQ^ of the sprat. The intraovarian development ofthe herring has been worked out by Kupffer and subsequentlyby Brook (3rd and 4th Ann. liep. S. F. B.). Eggs were obtained here on Feb. 5, 1S85, from Anstruther,and hatched out in the laboratory in twenty-five days. Newly hatched forms occurred on March 7, 1887, andlarval and post-larval forms in March and the beginning ofApril in 1887 and 1889. The period of incubation varies with the temperature *.It is probably never less than three weeks in the early spring,but it may be barely a week in the autumn. Thus, except iuvery early localities, young herrings cannot be expected beforethe beginning of March. In 1889 great numbers of young-herrings were obtained, the first being early postlarval formson Marcli 22 and larval and postlarval on Marcli 28. The newly hatched herring (figure 1), about ^r inch, longf.,^ Fio-. is in the larval condition \, i. e. the yolk is still absorption of the yolk takes three or four days, when the * See Mr. Brooks account of Meyers experiments with regard to tem-perature, ]rd Annual Report Fisliery Board for Scotland, 1884, p. 49, t Kupffer gives the length of the newly hatcliud Baltic herring at 5-2-5-;3 millim. (3rd Ann. Rep. S. F. B, 1884, p. 47). \ Mr. J. T. Cunningham gives a figure of a larval herring in Trans. E. vol. xxxiii. pt, 1. It dilleri sliglitly liom my own figure. 370 Mr. E. W. L. Holt on the postlarval condition is reached. The month is from the firstwidely open and the ejes a brilliant silvery blue, the newlyhatched herring being thus in advance of its ally the sprat. For the first few days of its life the herring is unable torise from the bottom, lying on its side and occasionally lashingout with its tail; and even when able to rise it seems to keepnear th
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