. Animal studies. THE ARTHROPODS 119 which they poke into the face of any intruder. While the anemones or hydroids are made to do valiant service. Fig. 66.—Hermit-crab (Pagurus bernhardus) in snail shell covered with Hydractinia. with their nettle-cells, they also enjoy the advantages of a large food-supply which is attendant upon the free ride. 114. The crabs.—The most highly developed Crustacea are the crabs or short-tailed decapods which abound between tide-marks alongshore, and in diminishing numbers extend to great depths. The cephalothorax is usually relatively wide, often wider than lon
. Animal studies. THE ARTHROPODS 119 which they poke into the face of any intruder. While the anemones or hydroids are made to do valiant service. Fig. 66.—Hermit-crab (Pagurus bernhardus) in snail shell covered with Hydractinia. with their nettle-cells, they also enjoy the advantages of a large food-supply which is attendant upon the free ride. 114. The crabs.—The most highly developed Crustacea are the crabs or short-tailed decapods which abound between tide-marks alongshore, and in diminishing numbers extend to great depths. The cephalothorax is usually relatively wide, often wider than long, and the greatly reduced abdo- men is folded against the under side of the thorax. Corre- lated with the small size of the abdomen, the appendages of that region disappear more or less, but the remaining appendages are similar to those of the crayfish or lobsters. All these different parts, however, are variously modified in each species to fit it for its own peculiar mode of life. In some forms, such as the common cancer-crab (Fig. 67), the legs are comparatively thick-set and possessed of great strength, enabling them to defend themselves against most enemies. On the other hand, there are the spider-crabs with small bodies and relatively long legs, withal weak, and. 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 Jordan, David Starr, 1851-1931; Kellogg, Vernon L. [from old catalog].
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Keywords: ., bookauthorjordanda, bookcentury1900, bookdecade1900, bookyear1903
