. A manual of zoology. Zoology. 430 ARTHROPODA. velopmoiit and become strong walking legs, terminated either with claws or jiincers (cliel^). Usually the first pair is distinguished from the others by its size and by being chelate, and becomes not locomotor but grasping in function. In the development of a chela the penult joint sends out a strong process, the 'thumb,". Fro. 436.âErichtlius stage of SquiUn (orig.). which extends as far as the last joint (the â finger'), which closes against it. The mouth partsâa pair of mandibles, two pairs of maxillfe, and three pairs of maxillipeds (fig
. A manual of zoology. Zoology. 430 ARTHROPODA. velopmoiit and become strong walking legs, terminated either with claws or jiincers (cliel^). Usually the first pair is distinguished from the others by its size and by being chelate, and becomes not locomotor but grasping in function. In the development of a chela the penult joint sends out a strong process, the 'thumb,". Fro. 436.âErichtlius stage of SquiUn (orig.). which extends as far as the last joint (the â finger'), which closes against it. The mouth partsâa pair of mandibles, two pairs of maxillfe, and three pairs of maxillipeds (fig. 404)âlie in front of the first pair of legs. The maxillipeds (7, 6, 5)sliow clearly a biramous condition, while the maxilla? (4, 3) retain considerable of the original phyllopod character. In the man- dibles (3) there is always a strong basal joint, the edge of which serves as a jaw, while this may bear additional joints, \he pappus. Behind the month are a pair of scales, the paragnaths or mefastoma, formerly regarded as appendages. The antennfe are usually distinguished from their size as antennae (second pair) and antenniilie (first paii-, flg. 404). They have larfe Ijasal portions, which in the anteunuhe bear two many-jointed flagella,. 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
