PLATE XI.

[NLS note: a graphic appears here - see image of page]

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.

[NLS note: a graphic appears here - see image of page]

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.

[NLS note: a graphic appears here - see image of page]

Fig. 3 (×400). Microphotograph of an " actino " body in section. The central
                cavity contains the cellular elements of the embryo.