. Birds of other lands, reptiles, fishes, jointed animals and lower forms;. Zoology; Birds; Reptiles; Fishes. m' V/ i^w«' -i"'. -^^. P*o/. J, H". Savill,-Kent, LONG-SPINED SEA-URCHINS T/,! need-c-Iik! spirits 4 ,ia-urch\m arc o-vtr a fool in U-ng,h. Am! of ihfie crraturrs may h, somrlimci seen on tidally exposed areas of the £h,eensland Great Barrier Reef, -U'/iere this photograph ivas taken The membranous disk which covers the upper and smaller circular aperture in the living animal is perforated centrally by the vent, and around it are grouped the eye-spots and sundry
. Birds of other lands, reptiles, fishes, jointed animals and lower forms;. Zoology; Birds; Reptiles; Fishes. m' V/ i^w«' -i"'. -^^. P*o/. J, H". Savill,-Kent, LONG-SPINED SEA-URCHINS T/,! need-c-Iik! spirits 4 ,ia-urch\m arc o-vtr a fool in U-ng,h. Am! of ihfie crraturrs may h, somrlimci seen on tidally exposed areas of the £h,eensland Great Barrier Reef, -U'/iere this photograph ivas taken The membranous disk which covers the upper and smaller circular aperture in the living animal is perforated centrally by the vent, and around it are grouped the eye-spots and sundry \' apertures. A noteworthy feature associated with the greater portion of the structural details of the sea-urchin which'have been enumerat>=d is the dominance of the number h\e in the consthuent elements. It is found, for instance, that the perforated areas through which the tube-feet are protruded form, as with the petals and other elements of many flowers, five symmetrically corresponding segments. The dental apparatus comprises five equivalent tooth-like structures, and there are five eve-spots and five excretory' apertures at the upper pole. This particular number, with multiples of the same, is furthermore characteristic of all the typical members 23. 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 Cornish, C. J. (Charles John), 1858-1906. New York, University Society
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Keywords: ., bookcentury1900, bookdecad, booksubjectfishes, booksubjectzoology
