. Principles of economic zoo?logy. Zoology, Economic. OPHIDIA 239 ORDER II. OPHIDIA Snakes are considered degenerate lizards, and by some zo- ologists are classed with the lizards, and the group together called Order Squamata. The Ophidians are reptiles with no fore limbs, no pectoral girdle, no sternum or sternal ribs, but the ends of the dorsal ribs are connected with the ventral scales, or scutes, and both. f^l^OI/tC/^r^y Hlfltr-llMB& Fig. 197.—Rudimentary or vestigial hind limbs of python as exhibited in the skeleton and on the external surface of the animal (\ natural size). (Romanes.
. Principles of economic zoo?logy. Zoology, Economic. OPHIDIA 239 ORDER II. OPHIDIA Snakes are considered degenerate lizards, and by some zo- ologists are classed with the lizards, and the group together called Order Squamata. The Ophidians are reptiles with no fore limbs, no pectoral girdle, no sternum or sternal ribs, but the ends of the dorsal ribs are connected with the ventral scales, or scutes, and both. f^l^OI/tC/^r^y Hlfltr-llMB& Fig. 197.—Rudimentary or vestigial hind limbs of python as exhibited in the skeleton and on the external surface of the animal (\ natural size). (Romanes.) scales and ribs aid in the body motion. "A snake literally walks on the ends of its ; Vestiges of the hind limbs (Fig. 197) sometimes appear as Httle spurs on either side of the vent. The ribs, which begin with the second vertebra and continue to the end of the body, aid in res- piration. They aid in locomotion also, their ventral ends fitting into the "connective tissue of the sides of the ventral transverse scales (scutes)." The body is long and the vertebrae very numer- ous. They vary in size from the enormous ones of the tropics to our little green grass snakes. Some are aquatic, some terrestrial. 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 Daugherty, Lewis Sylvester, 1857-; Daugherty, L. S. , Mrs. , 1859-. Philadelphia, London, W. B. Saunders
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