postciricir 1i:iIf.Kann pnlustris.The four figurrs on tlic riglit sliow the siinie individual at two hours, one day, two days iind four tl:iys, rc'spectirely, nfter grnftiiig together.The figurcls on the left show the tiner surface marliiligs of the cpidcrmis nnd the sense organs of the lateral line.
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Ross Harrison (1908) studied this question.