. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . ts ofthe ventral surface of its host. The stalk divides and ramifies ina root-like manner within the body of the crab, from whose vitalelements it absorbs its nourishment. The roots spread like amycelium through the whole crab, even to the claws. Peltogaster lives on hermit-crabs. OPOSSUM-SHRIMPS 257 SUBCLASS MALACOSTRACA This subclass comprises highly organized Cnixfacea, usually ofconsiderable size, having the appendages much differentiated, thethorax with eight segments, an
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . ts ofthe ventral surface of its host. The stalk divides and ramifies ina root-like manner within the body of the crab, from whose vitalelements it absorbs its nourishment. The roots spread like amycelium through the whole crab, even to the claws. Peltogaster lives on hermit-crabs. OPOSSUM-SHRIMPS 257 SUBCLASS MALACOSTRACA This subclass comprises highly organized Cnixfacea, usually ofconsiderable size, having the appendages much differentiated, thethorax with eight segments, and the abdomen with seven segments. ORDER SCHIZOPODA The name, meaning cleft-footed, applies to the appendagesof the thorax, which are once-branched (biranionx). (Jills, whenpresent, are attached to these feet, and hang freely in the delicate carapace covers the thorax; the abdomen is propor-tionately very large, often twice the length of the Mysis the eggs are carried in pouches under the thorax, givingthe common name of opossum-shrimp to this small, transparent,phosphorescent GENUS Mysis M. sternolepis. About one inch in length; translu-cent; antennae very long; segments marked at joints\vit!i dark spots; the last two segments terminate in astout spine ; telson longer than the sixth segment; the sides are nearlystraight and are armed with spines; the extremity is cleft; eyes largeand prominent. Found abundantly in winter on the shores of still,muddy bays and sounds, especially among eel-grass. ORDER DECAPODA C TI n-foob <i ) The Dccapoda are named from their ten walking-legs. Thehigher forms of crustaceans belong to this order. All (In- Mm//oda have a similar anatomy, but arc placed in two subdivisions 17 258 MARINE INVERTEBRATES according to their external form. In Macrura, the first subdivi-sion, belong the lobsters, crawfish, shrimps, prawns, and hermit-crabs, animals having a long and more or less cylindrical body,with the abdomen e
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
