Natural history . . PLATE XIV. FIG. 1.—Sphrur). FIG. 5.—Polymastia invagnata, specimen cut in half ; nat. size, p. 15. FIG. (I.—Vertical section ( x 25). FIG. 7.—Flagellated chambers (diplodal) (x 100). FIG. s.—Stellate group of tyles in choanosotne (x 100) ; 8a, separate tyles of stellate groups (x loo) FIG. 0.—Straight style (x KIOI. FIG. 10.—Curved style (x 100); Ida, narrower head of another spicule (X 100). FIG. 11.—Sfcrongyle (x 100). FIG. 12.—Long slender tylu (X 100). FIGS. 13, 14.—Cortical tyles ( X 100). FIG. 15.—Choauosomal tyles (x 100); 15a, the same (x 100).

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