Animal life in the sea and on the land . Fiu;. 61.—Foot of Spider, magnified. 104 ANIMAL LIFE IN THE SEA AND ON THE Fig. 62.—Geometric Web op Garden-spider. The more highly developed spi-ders have a heart and blood-vessels. They breathe by air-sacs andtubes, which open on the under surfaceof the abdomen. The nervous ganglia ofthe head and thorax are united into a massslightly resembling a Spinning Silk.—Spiders are provided with

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1887