. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . not move at the same time, a continuous anduniform motion is kept up. Some species move with great rapid-ity, notably the sand-crab, Ocypoda arenaria. Often when pur-sued they will run into the surf instead of to their holes. Thecommon edible crab, Callinectes sapidus, of the Atlantic coast, thefiddler-crabs, and the spider-crabs are among the well-knownrepresentatives of Brachyura. FAMILY SWIMMING CRABS GENUS Ccircinides C. nicenas (M. J. Rathbun), Carcinus mcenas
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . not move at the same time, a continuous anduniform motion is kept up. Some species move with great rapid-ity, notably the sand-crab, Ocypoda arenaria. Often when pur-sued they will run into the surf instead of to their holes. Thecommon edible crab, Callinectes sapidus, of the Atlantic coast, thefiddler-crabs, and the spider-crabs are among the well-knownrepresentatives of Brachyura. FAMILY SWIMMING CRABS GENUS Ccircinides C. nicenas (M. J. Rathbun), Carcinus mcenas (Leach), the greencrab. This is one of the most common species on the Atlantic coast fromCape Cod to New Jersey, and is very abundant in Vineyard Sound, Buz-zards Bay, and Long Island Sound. It is found between tide-marks, fre-quently well up on the beach, hiding under loose stones, also in tide-poolsand in holes and cavernous places on the shore. It is from one and ahalf to two inches long, and a little more in breadth. It has five acuteteeth on each side of the anterior part of the carapace. Its color is green,. Cardnides mcenas, the green crab. spotted with yellow, making it quite conspicuous. The surface of thecarapace and limbs is more or less granulated. The posterior feet areflattened to form swimming-paddles. It is a very lively creature and hasreckless audacity when brought to bay, which justifies its specific name(which implies frenzy). The French call it crabe enrage. CRABS 275 GENUS Callinectes C. sapiens (Mary J. Rathbun), C. ItastatHs (Stimpson), the blue is the common edible oral) of the Atlantic coast. It is knownat the North as the blue crab, and at the South as the sea-crab. It isfound from Cape Cod to Florida, and after the lobster is the crustaceanwhich has the greatest commercial value, being taken in immense quan-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
