College Zoology

Cover College Zoology
College Zoology
Robert William Hegner
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Cold-blooded vertebrates breathing by means of lungs and usually having a scaly skin.
Class VI. AVES (Lat. Avis, bird). BIRDS (Figs. 470-509). - Warm-blooded vertebrates with the fore limbs modified into wings and the body covered with feathers.
Class VII. MAMMALIA (Lat. Mamma, breast). HAIRY QUAD- RUPEDS, WHALES, SEALS, BATS, MONKEYS, and MAN (Figs. 510- 550). Warm-blooded vertebrates with a hairy covering at some stage in their existence; the young nourished after birth by the secretion of th
...e mammary glands of the mother.
Plan of Structure. The vertebrates resemble the other chordates in their metamerism and bilateral symmetry and in the NEURALTUBE ( cffffBffo SPIN A L CANAL) . SPINAL CORD yC NOTOCHORD VISCERAL BRAIN ORAL CAVITY INTERNAL GILL SLITS, HEART SPLEEN CLOACA URINARY BLADDER LIVEK 'fliLE DUCT PANCREAS FIG. 345. Diagrammatic longitudinal section of a vertebrate (female). (From Wiedersheim. ) possession of a ccelom, a notochord, and gill-slits at some stage in their existence, and a dorsal nerve tube.


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