First lesson in zoology : adapted for use in schools . warning the intruder; the rattle is sprung before thesnake strikes. The poisonous snakes stand lowest in the series; they aresucceeded by the striped snake, milk-adder, and by theboas, which attain a length of five metres ; while the ana-conda grows eight metres long. T/ie Turtlex.—Eetracing our steps in the path ending inthe snakes, we return to the point where were reptiles with 192 FIRST LE880N8 IN ZOOLOGY. four limbs, and follow another path leading to the in these creatures we have very singular, highly-modi-fied forms, sp
First lesson in zoology : adapted for use in schools . warning the intruder; the rattle is sprung before thesnake strikes. The poisonous snakes stand lowest in the series; they aresucceeded by the striped snake, milk-adder, and by theboas, which attain a length of five metres ; while the ana-conda grows eight metres long. T/ie Turtlex.—Eetracing our steps in the path ending inthe snakes, we return to the point where were reptiles with 192 FIRST LE880N8 IN ZOOLOGY. four limbs, and follow another path leading to the in these creatures we have very singular, highly-modi-fied forms, specially adapted to a life of unusual has been kind to the turtles; she has given them astrong shell, into which the head and legs may be with-drawn, so that they can get all the food they want, and yetnot become food for other animals. She has endowed themwith wonderful vitality and long life, adapting them forlife on the land, in rivers and lakes, and in the high the turtle is slow, it is sure; it does not push itself along. Fig. 199.—Skeleton of the common Spotted Turtle. Mn, mandible; 0, orbit ofeye; ^, ear-opening; iif, hyoid bone; Ce?-, cervical vertebrae; Dor, dorsal ver-tebrae consoUdated with the carapace, Cava; Can, caudal vertebrae; S,scapula; Co, coracoid: St, sternum: Hum, humerus; Had, radius; Ul, ulna;Car, carpal bones; M, metacarpals; n, ilium; Piih, pubic bone; Is, ischium;Fern, femur; T, tit)ia; ff, fibula; Tar, tarsus; Pes, foot. on its belly, like an ordinary lizard, but its legs are so per-fectly formed that it can walk, lifting its body above theground; its senses are acute, so that it can perceive comingdanger and withdraw into its shell, or, if near or in thewater, dive to the bottom out of harms way. No one is at a loss to recognize a turtle at sight; all havea shell, and the toothless jaws are protected, as in birds, byhomy sheaths. The skeleton of the turtle should be carefully will be seen that the shell consist
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
