The New Encyclopædia Britannica: The new Encyclopædia BritannicaEncyclopædia Britannica, 1992 |
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Page 244
... body ; it is supported by a notochord and contains a nerve cord . Gravity- and light- sensitive sensory vesicles along the dorsal surface of the larval body orient the animal as it swims . After a period of up to a few days , the larva ...
... body ; it is supported by a notochord and contains a nerve cord . Gravity- and light- sensitive sensory vesicles along the dorsal surface of the larval body orient the animal as it swims . After a period of up to a few days , the larva ...
Page 246
... body . The atrium protects the gills . Tunicates also have an atrium , but its evolution is probably independent of that of the cephalochordrate atrium . The bodies of lancelets , like those of fishes and other ver- tebrates , are ...
... body . The atrium protects the gills . Tunicates also have an atrium , but its evolution is probably independent of that of the cephalochordrate atrium . The bodies of lancelets , like those of fishes and other ver- tebrates , are ...
Page 383
... body weight ) . These relative percentages of body weight to blood volume are similar to those of vertebrates and differ markedly from those of species with open circula- tory systems , in which hemolymph may constitute 40 to 50 percent ...
... body weight ) . These relative percentages of body weight to blood volume are similar to those of vertebrates and differ markedly from those of species with open circula- tory systems , in which hemolymph may constitute 40 to 50 percent ...
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