p of the Throat in the genus Anolis, ' IS 



is situated immediately under the larynx. * It has two long, 

 slender, bony processes on each side, "which for the sake of dis- 

 tinction, I shall term the anterior + and posterior | lateral pro- 

 cesses, — a small one, § which is filiform, given off from the ante- 

 rior part of the bone, and closely connected with the under part 

 of the tongue, — and a very long, delicate, and elastic cartilage, [j 

 extending from the body of the bone nearly to the middle of the 

 abdomen, immediately beneath the skin, to the internal surface of 

 which it is attached by condensed cellular tissue. In its form it 

 is slightly flattened and tapering to its extremity, where it is ex- 

 tremely slight and flexible. 



The anterior lateral process extends backwards to the angle of 

 the lower jaw, over the muscles of which it is curved upwards. 

 The posterior lateral process is placed in a similar direction, but 

 does not take the same curve over the edge of the jaw. These 

 two processes run parallel to each other tlirough almost their 

 whole length, but at a small distance apart. 



There are several pairs of muscles attached to these little bones, 

 by the action of which the phasnomeua are produced M'hich it is 

 my object to explain. Of these the following are the principal. 

 A broad strong muscle arises from the whole edge of the posterior 

 lateral process, and is inserted into the clavicle. It is conse- 

 quently of considerable length ; and by its contraction the whole 

 bony frame-work is drawn back and a little downwards, so that 

 the distance between the two extremities of the long elastic car- 

 tilage being diminished, this organ is thrown into a curve, and the 

 skin of the throat and belly is stretched upon it, exactly as the 

 silk is strained upon the whalebone ribs of an opened umbrella. 

 The parts are restored to their natural state by the action of the 

 following muscles. From the edge of the anterior lateral process 

 arises a muscle which is inserted into nearly the whole length of 

 the base of the lower jaw, — and another taking its origin from the 

 anterior part of the body of the os hjjoides^ is inserted into the 

 symphysis of the jaw or chin. It is obvious that the contraction 

 of these muscles will draw the whole of the little bony frame for- 

 wards, and thus restore the whole structure to its usual quiescent 



■ * PL 11. Fig. 1. a. f Fig. \.b. X Fig, I.e. § Fig. \.d. \\ Fig. 1. e. 



