. Elementary text-book of zoology. Zoology. 498 ABACILNIDA. Order 3. — ARANEIDA * (SPIDERS). Arachnida -with poison glands in the subckelate ckelicerce ; with pediform pedipalpi and stalked unsegmented abdomen. They lave four or six spinning mammittce, and two or four pulmonary sacs. The peculiar shape of the true spiders is clue to the swollen and unsegmented abdomen, the base of which is constricted to form the stalk by which it is united to the rest of the body (fig. 392). The large subchelate chelicerse, which project beyond the front of the head, consist of a powerful basal portion groove
. Elementary text-book of zoology. Zoology. 498 ABACILNIDA. Order 3. — ARANEIDA * (SPIDERS). Arachnida -with poison glands in the subckelate ckelicerce ; with pediform pedipalpi and stalked unsegmented abdomen. They lave four or six spinning mammittce, and two or four pulmonary sacs. The peculiar shape of the true spiders is clue to the swollen and unsegmented abdomen, the base of which is constricted to form the stalk by which it is united to the rest of the body (fig. 392). The large subchelate chelicerse, which project beyond the front of the head, consist of a powerful basal portion grooved on the inner side, and a claw-shaped terminal joint at the point of which the duct of a poison gland opens (fig. 393). At the moment of the bite the secre- tion of this gland flows into the wound, and in the case of small animals causes an almost instanta- neous death. The pedipalpus bears on its broad coxal joint, which constitutes a kind of biting- blade (fig. 392 A"), a many- jointed palp, the terminal re- gion of which is peculinrly modified in the male and func- tions as a copulatory. organ. The mouth is bounded on the under side by an impaired plate, forming a sort of lower lip. The four pairs of usually long legs, whose form and si/ em\ w[t\i two toothed Kt. B. 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
