. First lessons in zoology. Zoology. 220 FIRST LFSSONS IN ZOOLOGY nating in a fivc-tocd foot; in the lizards the boih' is more elongate, and witli usualU' four legs, but sometimes with two onh', or e\-en none at all; while in the snakes the long, slender, c}dindrical body is legless, or at most has mere rudiments of the hinder limbs. With the reptiles, locomotion is as often effected by the bending or scrpen-. Fic. 17S.— V sea-turtle. Cluloiu- })iydi!s. C(:»nimoii in tn-j-iic ncecins. (This turtk- is six feet Imii;: ilrawti from a pli(itut;raph by R. E. Siiodgrass, made on the (lalapai^'os Ish
. First lessons in zoology. Zoology. 220 FIRST LFSSONS IN ZOOLOGY nating in a fivc-tocd foot; in the lizards the boih' is more elongate, and witli usualU' four legs, but sometimes with two onh', or e\-en none at all; while in the snakes the long, slender, c}dindrical body is legless, or at most has mere rudiments of the hinder limbs. With the reptiles, locomotion is as often effected by the bending or scrpen-. Fic. 17S.— V sea-turtle. Cluloiu- })iydi!s. C(:»nimoii in tn-j-iic ncecins. (This turtk- is six feet Imii;: ilrawti from a pli(itut;raph by R. E. Siiodgrass, made on the (lalapai^'os Ishimls. l^icific (_>cean.) tine movements of the trunk as b)' the use of the legs. Among lizards and snakes the body is co\'ered -with horn\' epidermal scales or plates, w hile among the turtles and crocotliles there ma)- be, in addition to the epidermal plates, a real deposit of Ijone in the skin wherebx' the effectiveness (jf the armor is increased. The epidermal covering of snakes and lizartls is periodically moulted, or, as we sa)', the skin is shed. The bright colors antl pat- terns of snakes antl of many lizards are due to the presence and arrangement of pigment cells in the skin. Amon<i-. 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1903
