. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. 440 MANUAL OF ZOOLOGY. world. The tongue is wide, flat, scarcely notched at its free extremity, and hardly at all protrusible. The eyes are large, with extremely short lids, the pupil liiostly linear, but some- times circular. The teeth are numerous, small, compressed, and implanted on the inner edge of the jaw. The nails are mostly hooked and retractile, and the toes are furnished below with imbricated plates. The animal is capable of running on the smoothest surfaces, or suspen
. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. 440 MANUAL OF ZOOLOGY. world. The tongue is wide, flat, scarcely notched at its free extremity, and hardly at all protrusible. The eyes are large, with extremely short lids, the pupil liiostly linear, but some- times circular. The teeth are numerous, small, compressed, and implanted on the inner edge of the jaw. The nails are mostly hooked and retractile, and the toes are furnished below with imbricated plates. The animal is capable of running on the smoothest surfaces, or suspending itself back-downwards. They feed on insects, and are found in abundance in the warmer parts of both the Old and New Worlds. The IguanidcB constitute another large family of Lizards, also belonging partly to the Old and partly to the New World. The tongue is thick, fleshy, notched at its extremity only, and not protrusible. Mostly there is a dorsal crest, and a goitre or throat-pouch. The body is covered with imbricated scales. Only one species of the family is European, but the group is represented by numerous species in N. and S. America, Asia, Africa, and Australia. They are often divided into "ground- iguanas," in which the body is flat and depressed, and " tree- iguanas," in which the body is compressed. The members of the genus Iguana itself (fig. 169) are confined to the New World, and, are distinguished by haying the throat furnished. Fig. 172.—Head of a Chameleon (C. Petsrsii)—^-c Gray. with a pendulous dewlap or fold of skin, the edge of which is toothed. The back and tail, too, are furnished with an erect crest of pointed scales. The Iguana attains a length of from four to five feet, and though not of a very inviting appearance, is highly esteemed as food. The Basilisks {Basiliscus) have the tog of the head furnished with a membranous sac, which can be' distended with air at will. The Agamidm agree with the Iguanas in most respects, bu
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