. Elementary text-book of zoology. Zoology. 518 FIG. 423.—Embryo of Stroiigylosoma (after E. Metschnikoff). their eggs in earth. The just-hatched young often pass through a metamorphosis, having at lirst only three or seven pairs of legs in addition to the antenna?, and a few somites without limbs (fig. 423). The young animals undergo numerous moults, and gradually increase in size: the extremities sprout out on the somites, which are already present. New somites are constricted oft' from the termi- nal one until the full number is completed; the number of ocelli and of the joints
. Elementary text-book of zoology. Zoology. 518 FIG. 423.—Embryo of Stroiigylosoma (after E. Metschnikoff). their eggs in earth. The just-hatched young often pass through a metamorphosis, having at lirst only three or seven pairs of legs in addition to the antenna?, and a few somites without limbs (fig. 423). The young animals undergo numerous moults, and gradually increase in size: the extremities sprout out on the somites, which are already present. New somites are constricted oft' from the termi- nal one until the full number is completed; the number of ocelli and of the joints of the antenna? is increased, and the resemblance to the sexual animal is gradually perfected. In other cases (Scolopendra, GeopldlidcK] the embryo already possesses the full number of appendages. Order 1.—CHILOPODA.* Myriapoda of usually flattened form, with long many-jointed antennce, and mouth parts adapted for predatory habits, with only one, pair of appendages to each segment. The body is long and usually flat- tened. The chitinous exoskeleton is hardened on the dorsal and ven- tral surface of each somite, consti- tuting the tergal and sternal plates, while on the sides of the somites it remains soft. In certain forms some of the terga develop to large shields, which over-lap the smaller terga of the intermediate somites (fig. 424). The number of legs is never greater than that of the sepa- rate segments, a single pair only being developed on each segment. The antenna? are long and many- jointed, and are inserted beneath the frontal margin. The eyes are simple or aggregated ocelli, except in the genus Scutigera which has facetted. 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. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
