. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. METAMORPHOSIS. 283 interstitial tissue filled with round cells is formed external to the lateral discs, and with participation of the thickening skin. This tissue becomes the seat of calcareous deposits, and forms the dermal skeleton of the adult Echinoderm (fig. 228 a, b). The canal of the dorsal pore has in the meantime changed its simple form and developed into the circular vessel with diverti- cula, which are destined to become the ambulacral trunks. As development progresses, the young
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. METAMORPHOSIS. 283 interstitial tissue filled with round cells is formed external to the lateral discs, and with participation of the thickening skin. This tissue becomes the seat of calcareous deposits, and forms the dermal skeleton of the adult Echinoderm (fig. 228 a, b). The canal of the dorsal pore has in the meantime changed its simple form and developed into the circular vessel with diverti- cula, which are destined to become the ambulacral trunks. As development progresses, the young animal appears as a, more or less spherical or pentagonal body, or as a star with short arms, in propor- a. 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. London, Swan Sonnenschein & co.
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Keywords: ., book, bookcentury1800, bookcollectionbiodiversity, bookdecade1890
