. Text book of zoology. Zoology. Glass 4. RepHKa. 417 animal are identical in form (homodont). (For tlie poison teeth of snakes, see p. 423, and Fig. 348). The tongue, which is attached behind free in front, is very varied in form; in the Crocodilia and Chelonia, it is but slightly movable, with a short tip, and incapable of protrusion; whilst in the Lacertilia, it has generally a long, often very long, and bifid, tip; in the Ophidia, too, the tongue is long, narrow, and bifid, and can be stretched far out of the mouth; here, and in one division of the Lacertilia also, it can be withdrawn into
. Text book of zoology. Zoology. Glass 4. RepHKa. 417 animal are identical in form (homodont). (For tlie poison teeth of snakes, see p. 423, and Fig. 348). The tongue, which is attached behind free in front, is very varied in form; in the Crocodilia and Chelonia, it is but slightly movable, with a short tip, and incapable of protrusion; whilst in the Lacertilia, it has generally a long, often very long, and bifid, tip; in the Ophidia, too, the tongue is long, narrow, and bifid, and can be stretched far out of the mouth; here, and in one division of the Lacertilia also, it can be withdrawn into" a sheath on the floor of the mouth. (For the peculiar tongue of the Chameleons, see p. 422). The oesophagus is long, and capable of considerable distension. The stomach of Crocodiles is very muscular, provided on each side with a tendinous disc, to which the muscle cells are attached; it suggests the gizzard of Birds. The small intestine varies in length, the rectum is short. Respiratory organs. The trachea of Reptilia is long, and its wall is strengthened with numerous cartilaginous rings. The. Fig. 345.—Diagrams of various lungs. A Triton, B Frog or small Lizard, C Tortoise, D Turtle, b bronchus, ft cavity of the lung, a evagination of the lung. Connective tissue clotted.—Orig. anterior portion, the larynx, is furnished with special pieces of cartilage, and in some Lacertilia (Geckos, Chameleons), as well as in the Crocodilia, possesses a pair of vocal cords which do not occur in others. The entrance from the mouth is through a longitudinal slit behind the tongue. At the hinder end, the trachea divides into two E E. 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 Boas, J. E. V. (Johan Erik Vesti), 1855-1935; Boas, J. E. V. (Johan Erik Vesti), 1855-1935. Lehrbuch der Zoologie. London, Sampson Low
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
