. Animal studies. Fig. 184.—The mole cricket (Gryllotalpa), with fore feet modified for digging. Fig. 185.—A water-beetle {Hydroph- ilus). tube at the posterior tip of the body, while the pupae have a pair of horn-like tubes on the back of the head end of the body. 260. Degree of structural change in adaptations.—While among the higher or vertebrate animals, especially the fishes and reptiles, most remarkable cases of adaptations occur, yet the structural changes are for the most part ex- ternal, never seriously affecting the development of the internal organs other than the skeleton. The / \\
. Animal studies. Fig. 184.—The mole cricket (Gryllotalpa), with fore feet modified for digging. Fig. 185.—A water-beetle {Hydroph- ilus). tube at the posterior tip of the body, while the pupae have a pair of horn-like tubes on the back of the head end of the body. 260. Degree of structural change in adaptations.—While among the higher or vertebrate animals, especially the fishes and reptiles, most remarkable cases of adaptations occur, yet the structural changes are for the most part ex- ternal, never seriously affecting the development of the internal organs other than the skeleton. The / \\\ \A/1 organization of these J^- y/rfi . /m higher animals is much ®& less plastic than among , the invertebrates. In general, the higher the type the more persistent and un- changeable are those structures not immediately exposed. 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 Jordan, David Starr, 1851-1931; Kellogg, Vernon L. [from old catalog].
Size: 2896px × 863px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorjordanda, bookcentury1900, bookdecade1900, bookyear1903
