. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. io6 ANIMAL ACTIVITIES. {h) A swimmeret from the third abdominal segment seen from behind X 6. (i) Sixth swimmeret. Homologies. In the lobster, shrimp, and crayfish, the antennae, claws, legs, and swimmerets are seen to h. Fig. 92.—Longitudinal Section of Crayfish, a, anus; , dorsal artery; , intestine or hind- gut; h, heart; , midgut; li, liver; s, stom- ach; ki kidney; la, labrum or lip; , sternal artery; , nerve-chain; , ventral artery. be similarly situated and to bear a strong resemblance
. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. io6 ANIMAL ACTIVITIES. {h) A swimmeret from the third abdominal segment seen from behind X 6. (i) Sixth swimmeret. Homologies. In the lobster, shrimp, and crayfish, the antennae, claws, legs, and swimmerets are seen to h. Fig. 92.—Longitudinal Section of Crayfish, a, anus; , dorsal artery; , intestine or hind- gut; h, heart; , midgut; li, liver; s, stom- ach; ki kidney; la, labrum or lip; , sternal artery; , nerve-chain; , ventral artery. be similarly situated and to bear a strong resemblance in structure. If we should study the growth of these three animals, we should find that these appendages arise in a similar way in the process of development. Parts of animals similar in position, structure, and origin are said to be homologous. The wings of the butterfly are homologous with those of the grasshopper. The three pairs of jointed legs in the caterpillar are homol- ogous with the legs of the butterfly. When parts correspond simply in use and not in origin or structure, they are said to be analogous. Thus the- wing of a bird and the wing of a butterfly are analogous but not Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original French, Nathaniel Stowers, 1854-. New York [etc. etc. ] Longmans, Green and Co
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