. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. 518 MTEIAPODA. their eggs in earth. The just-hatched young often pass through a metamorphosis, having at first only three or seven pairs of legs in addition to the antennae, 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 off from the termi- nal one until the full number is completed; the number of ocelli and of the joints of the ant
. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. 518 MTEIAPODA. their eggs in earth. The just-hatched young often pass through a metamorphosis, having at first only three or seven pairs of legs in addition to the antennae, 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 off from the termi- nal one until the full number is completed; the number of ocelli and of the joints of the antennae is increased, and the resemblance to the sexual animal is gradually perfected. In other cases {Scolopendra, Geophilidce) the embryo already possesses the full number of Fig. 423.—Embryo of SfronqyUsoma (after E, iletschnikoff). Order 1.—Chilopoda.* Myriapoda of usually flattened form, ivith long many-jointed antennce, and mouth parts adapted for predatory habits, with only one paAr 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, whUe on the sides of the somites it remains soft. In certain for^s some of the terga develoj) to large shields, which over-lap the smaller terga of the intermediate somites (fig. 424). The number of legs is never gi-eater than that of the sepa- rate segments, a single pair only being developed on each segment. The antenna? are long and many- „ « .„, T,y ,. f e , in n lomtcd, and are inserted beneath the Fio. 42i,—Liihohuf forficaiut (after 0. •• ' ), x/, Poison claws. frontal margin. The eyes are simple or aggi'egated ocelli, except in the genus Scutigera which has facetted * Newport, " Monograph of the Class Myriapoda, order Chilopoda," Linnrran, Transactions, Please note that these images are extracted from scanned page images that may ha
Size: 1830px × 1365px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectanimals, bookyear1892
