. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. FiG. 175.'—Lithobius forcipatus. (After Carpenter.) lar in form and function (vegetative repetition), indicates a low position in the scale of organisms. As we go up the scale the number of parts used for one function be- comes less, and their efficiency becomes correspondingly greater. Legs are an admirable illustration of this law. In marine worms and in the lowest Crustacea there is an indefinite but very great number of similar legs. As we rise among Crustacea the number becom
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. FiG. 175.'—Lithobius forcipatus. (After Carpenter.) lar in form and function (vegetative repetition), indicates a low position in the scale of organisms. As we go up the scale the number of parts used for one function be- comes less, and their efficiency becomes correspondingly greater. Legs are an admirable illustration of this law. In marine worms and in the lowest Crustacea there is an indefinite but very great number of similar legs. As we rise among Crustacea the number becomes definite, and countable as legs, when there are fourteen or seven pairs. These are called tetradecapods. In the higher Crusta- cea—crabs, crawfish, etc.—they are reduced to five Fig. 176.—Syllis prolifera. These are therefore called decapods. In spiders and scor- pions there are only four pairs. These might be called octopod insects. In true insects they are reduced to three. 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 LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
Size: 2589px × 965px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomycomparative
