. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 114 Z<JOLOGY The Position of Spiders in the Zoological System. — Spiders clearly belong to the arthropods because, like the grasshopper, they have a thick cuticula (which is molted as the animal growsj and jointed legs. Spiders differ from insects, however, in several important respects. They possess four pairs of legs instead of three. The head and thorax are united. The. Fig. — A sanrh'waste Tdune region of Fire Island Beach, Long Island) where many spiders burrow in the sand. antennae are al)sen
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 114 Z<JOLOGY The Position of Spiders in the Zoological System. — Spiders clearly belong to the arthropods because, like the grasshopper, they have a thick cuticula (which is molted as the animal growsj and jointed legs. Spiders differ from insects, however, in several important respects. They possess four pairs of legs instead of three. The head and thorax are united. The. Fig. — A sanrh'waste Tdune region of Fire Island Beach, Long Island) where many spiders burrow in the sand. antennae are al)sent. Consequently it is an error to speak of spiders as insects; rather they, together with several allied groups, belong to a distinct division of the arthropods, the Arachnida. The Arachnida, indeed, breathe air, but the air passes into a little pouch on the under side of the abdomen and in between numerous thin sheets, like the leaves of a book, so that the whole breathing apparatus is often called a lung book. They have also a system of air-tubes which is much. 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 Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
