PLATE XI.
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Fig. 1 (×400). Microphotograph of the " Spindalis " type of egg
in the tissue, showing the blunt and the pointed ends. Note
its similarity with microphotograph No. 2, Plate IX.
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Fig. 2(×400). Microphotograph showing a fully matured mira-
cidium still attached to the spiny portion of the egg, lying in
the space left by the egg. The caudal extremity of the
embryo can be seen inside the eggshell.
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Fig. 3 (×400). Microphotograph of an " actino " body in section. The central
cavity contains the cellular elements of the embryo.