. A manual of zoology. Zoology. STBBOZOA. 235 vex or exumbrella—vfith ectodermal epithelium. At the margin of the bell the sub- and exumbrellar ectoderm is produced into a two-layered sheet with a central opening, the velum or craspedon (fig. 178, B, v) of systematic importance, since these medusae are often spoken of as Craspedota. Tentacles (usually 4, 8, or multiples in number) also arise from the edge of the bell just outside the Fig. \1^.--Tiarapileata, (After Haeckel, from Ilatschek ) Comparable to the tongue of the bell or the handle of the umbrella is the manubrium, hanging fro
. A manual of zoology. Zoology. STBBOZOA. 235 vex or exumbrella—vfith ectodermal epithelium. At the margin of the bell the sub- and exumbrellar ectoderm is produced into a two-layered sheet with a central opening, the velum or craspedon (fig. 178, B, v) of systematic importance, since these medusae are often spoken of as Craspedota. Tentacles (usually 4, 8, or multiples in number) also arise from the edge of the bell just outside the Fig. \1^.--Tiarapileata, (After Haeckel, from Ilatschek ) Comparable to the tongue of the bell or the handle of the umbrella is the manubrium, hanging from the highest point of the subumbrella and bearing the month at its tip. It contains the chief digestive space from which radial canals run on the sub- umbrellar surface to a ring canal in the margin of the umbrella. The radial canals are usually four in number, but in some species the number is increased during growth even to a hundred or more. Manubrium and canals are lined by entoderm, which also extends into the tentacles and forms their Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
