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Figs. 1-20 illustrate the growth of the seed oysters caught on small stones. Figs. 1-10 show three-month-old oysters attached to living snails (littorina littorea). Figs. 11-14 show the oysters of the same age attached to small stones. Figs. 15-18 show oysters one and one-half years old attached to small peggles, while Figs. 19-20 show two and one-quarter-year-old oysters attached in the same fashion. Fig.16 gives a peculiar illustration of the method of attachment. The young oyster has formed an attachment to a second pebble towards its free end at some distance from the first, indicating that the mantle, even at the age of one year, retains the power of secreting a fixative.

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