. The Cambridge natural history. Zoology. ANATOMICAL STRUCTURE S( granules. The eyes are very remarkable. The eyeballs them- selves are large, but the eyelids are united into one fold with a small central opening. However, when the Chameleon is asleep" the margins of this opening sometimes become more slit-like. The right and left eye can be, and are incessantly, moved separately from each other, and the creature squints terribly. Each eyeball, together with the pin-hole eyelid, is rolled up and down, backwards and forwards, independently of the other eye. This is a unique feature, but it
. The Cambridge natural history. Zoology. ANATOMICAL STRUCTURE S( granules. The eyes are very remarkable. The eyeballs them- selves are large, but the eyelids are united into one fold with a small central opening. However, when the Chameleon is asleep" the margins of this opening sometimes become more slit-like. The right and left eye can be, and are incessantly, moved separately from each other, and the creature squints terribly. Each eyeball, together with the pin-hole eyelid, is rolled up and down, backwards and forwards, independently of the other eye. This is a unique feature, but it also occurs in people who squint badly. The question " What, and how, do these creatures see ? " is therefore quite idle, especially since in reptiles binocular vision does not exist at all and, consequently, cannot be disturbed by squinting. The tongue has attained an extraordin- ary development. The tongue proper (Fig. 152) Yig. 149.—a, Dorsal, B, ventral, and C, lateral view X1. Cond, Jur/, jugal;. of the skull of Ghamadeon vulgaris. occipital condyle ; EP, ectopterygoid ; Lac, lacrymal; Pal, palatine ; Par, parietal; Prf, prefrontal; , postfrontal ; Ptg, pterygoid; Q, quadrate ; Sq, squamosal; Vo, vomer. is club-shaped, and is covered with a sticky secretion. The base or root of the tongue is very narrow, composed of extremely elastic fibres, and is supported by a much-elongated copular piece of the hyoid. The elastic part of the tongue is, so to speak, telescoped over the style-shaped copula, and the whole apparatus is kept in a contracted state like a spring in a tube. A pair of wide, very elastic blood-vessels and special elastic bands extend from the base into the thick end of the 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed;
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
