Principles of Animal Biology |
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Page 74
... tube which terminates in a second opening to the ex- terior , the anus , situated dor- sally where the legs are joined to the body . This tube , known as the alimentary canal or diges- tive tract , has everywhere mus- cular walls , an ...
... tube which terminates in a second opening to the ex- terior , the anus , situated dor- sally where the legs are joined to the body . This tube , known as the alimentary canal or diges- tive tract , has everywhere mus- cular walls , an ...
Page 94
... tube . Only the first and last of these need be considered in connection with the circulation since the length of tube traversed is approximately constant in the blood vessels . As the activity of the heart is an intermittent quantity ...
... tube . Only the first and last of these need be considered in connection with the circulation since the length of tube traversed is approximately constant in the blood vessels . As the activity of the heart is an intermittent quantity ...
Page 235
... TUBE FEET MOUTH FIG . 99 - DIAGRAMMATIC REPRESENTATION OF AN IDEAL ECHINODERM exterior through a finely perforated plate , the madreporite . The gonads are arranged radially between the longitudinal canals of the tube - feet system ...
... TUBE FEET MOUTH FIG . 99 - DIAGRAMMATIC REPRESENTATION OF AN IDEAL ECHINODERM exterior through a finely perforated plate , the madreporite . The gonads are arranged radially between the longitudinal canals of the tube - feet system ...
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acid Amphibia anatomy animals Annelida appendages Arachnids arteries Arthropod behaviour biology birds blood body bones called capillary cavity cells characteristic characters ciliated Class colour crossed Crustacea Darwin dorsal double recessive Drosophila embryo epithelium evolutionary experiment experimental fact factors females fertilised fibres fishes fowl frog gametes ganglion Genera genes genetic gill glands gonads grey heart hereditable properties individuals inheritance insects Lamarckian land Vertebrates large number larvæ limbs Linnæus living matter lungs male Mammals mated melanophores Mendel microscopic Mollusca mouth muscle muscular mutant Natural Selection nerve notochord offspring organs oxygen pair of chromosomes parents phylum pigment plants principle purple receptor red-eyed reflex reptiles result scorpion segments side single skeleton skin skull species sperm stage stimulation striped muscle structure tadpole tion tissue toads Trilobites tube Unity of Type veins ventral Vertebrates vestigial walnut white-eyed wild type yolk yolk plug