Natural history . x. 4 j*: F f •• « fe .. PLATE IX. Fin. ]..— Viiutihyr<i bminiln Solla<. J nat. size, p. (!. Fin. 2.—Vertical section through an osc-ule ( x 5). Fir;. 3.—Young specimen with one porocalyx in front and one oscule at the upper end (X 8). Fi<;. 4.—Cortical oxea from a large specimen (x 10). FK;S. 5-7.—Single and double silica pearls (x TIHIJ. FICJS. 8-12.— Silica pearls around which crystals of sea-salts have become deposited ( X 42f>). Fios. 13, 14.—Spheroidal masses of sea-salt crystals (in optical section), which stain deeply in carmine (X 425).Fie. —Cittnitll/
Natural history . x. 4 j*: F f •• « fe .. PLATE IX. Fin. ]..— Viiutihyr<i bminiln Solla<. J nat. size, p. (!. Fin. 2.—Vertical section through an osc-ule ( x 5). Fir;. 3.—Young specimen with one porocalyx in front and one oscule at the upper end (X 8). Fi<;. 4.—Cortical oxea from a large specimen (x 10). FK;S. 5-7.—Single and double silica pearls (x TIHIJ. FICJS. 8-12.— Silica pearls around which crystals of sea-salts have become deposited ( X 42f>). Fios. 13, 14.—Spheroidal masses of sea-salt crystals (in optical section), which stain deeply in carmine (X 425).Fie. —Cittnitll/i xtti/itttt var. inirroxignm. vertical section of cortex in poral region, showing radial cortical oxeas aivhing over sub-dermal spaces (x 12).Fie. 16.—franieUfi niiijiltn var. »i<n<t, vertical section of cortex in oscular region showing absence of radial cortical oxeas (x 12). FIG. 17. Cru/iifllii xiiiiitto- var. piichyrrlnibdiix. rlagelluted chambers (x 200).Fins, is, 111.—Collar cells of
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Keywords: ., bookauthorbritishnationalantarc, bookcentury1900, bookdecade1900
