. La biologie des araignées. Les araignées, les insectes. Certains autres arachnides ou mis ensemble. Ils sont utilisés dans leur enfouissement. La dernière paire d'appendices sur le prosoma sont le chilaria. Les joints de l'pedipalpi coxal et de tous les jambes ont réalisé intérieurement processus couverts d'épines et meublées avec des dents broyeuses. Ils contribuent à l'alimentation avant d'masticating entre dans la bouche. L'appendice du premier segment abdominal est la médiane de l'opercule génital, par laquelle la femelle dépose les oeufs. Les cinq segments appariés report gill-livres (Fig. 109). Ces organes respiratoires sont ve

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. The biology of spiders. Spiders; Insects. SOME OTHER ARACHNIDA or brought close together. These are used in burrowing. The last pair of appendages on the prosoma are the chilaria. The coxal joints of the pedipalpi and of all the legs have inwardly directed processes covered with spines and furnished with crushing teeth. They assist in masticating the food before it enters the mouth. The appendage of the first abdominal segment is the median genital operculum, through which the female deposits the eggs. The next five segments carry paired gill-books (Fig. 109). These respiratory organs are very different from anything possessed by the land Arachnida. The gill-book itself is borne on the hind surface of the expodite or outer branch of the appendage. It consists of a hundred and fifty to two hundred leaves within each of which the blood is flowing, while the oxygen- ated water circulates be- tween the leaves. In this possession of breathing organs visible from outside the body, Limulus resembles the extinct Eurypterida. The king-crab spends the greater part of its life burrowing in the sand under shallow water. It is probable that in this comparatively unpopulated environment it enjoys a freedom from competition with the more active creatures, and that this has enabled it to persist in its relatively primi- tive form since the Silurian era. It makes its way through the mud with astonishing facility. Bending its body upwards, it urges the front edge of its carapace downwards and forwards, while the sharply-pointed spine is pressed into the mud behind. At the same time, the extensible fan-like organs which terminate the fourth pair of legs are thrust backwards, so that the lobes are opened by the. Fig. 109. crab. -Gill-book of the King- Partly after Shipley.. 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

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