. Crad/at "Crodv. Cro'dlot c)pa Text-fig. 20. Marrus antarcticus , , 'Discovery II' St. 943, 1000-750111. Nectophore; A, underside; B, upper side; C, lateral view; D, adaxial view, x4-6. The muscular lamella is attached along the pecked continuation of the pedicular canal. polygonal, epithelial cells measuring 0-04 x 0-02 mm. Often the exploded cnidoband may be found on bracts. Palpons are of the same length as siphons, but more slender. No filament has been observed at the base. Some of them, probably all, arise from the gonodendra. Gonophores observed
. Crad/at "Crodv. Cro'dlot c)pa Text-fig. 20. Marrus antarcticus , , 'Discovery II' St. 943, 1000-750111. Nectophore; A, underside; B, upper side; C, lateral view; D, adaxial view, x4-6. The muscular lamella is attached along the pecked continuation of the pedicular canal. polygonal, epithelial cells measuring 0-04 x 0-02 mm. Often the exploded cnidoband may be found on bracts. Palpons are of the same length as siphons, but more slender. No filament has been observed at the base. Some of them, probably all, arise from the gonodendra. Gonophores observed have all been female and monovon (Text-fig. 21 E). The largest eggs measure about 1-25 mm. in diameter. The position of the gonophores relative to the gastrozooids has not been determined. Dissection of female gonophores with a micro-manipulator showed that the endoderm of the outer thin coat (umbrella) forms four or more radial canals, and that there is no terminal opening. Inside this outer tunic is another, formed by the irregularly branched spadix (manubrium) (cf. Vogt, 1854, Tab. 10, fig. 25; and Huxley, 1859, pi. vi, figs. 13, 14; pi. ix, fig. 14) that is flattened out by the large ovum. When the ovum is partly grown the spadix grows up to one side of it and wraps branches
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
