The Growth of the Shell of Patella vulgata L

Authors


Summary.

  • 1The breeding-season extends from July to January.
  • 2Sexual maturity is reached at a length of 20–25 mni.
  • 3An merage size for a limpet of the last season's brood in Janiinry or February is 10 mm. A t the end of the first year it mag be 29 mm. long. Probable sizes at the end of the second and subsequent years are 38 mm., 44 mni., 48 mm., 53 mm. Shells over 50 mm. may be considerably more than five years old.
  • 4Sexual maturity is reached in the first year, and when the linipet is only half-grown.
  • 5The rate of growth decreases with age and maturity. It is slower during the colder months of the year.
  • 6Considerable changes take place in the ratios of the shelldimensions during growth.
  • 7These changes are probably in large part the expression of laws of growth, and not due to natural selection,

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