XIII.] THE FEOG. ISS 



floor of the mouth and to the front part of the lowei 

 jaw. Notice the slit of the glottis in the hinde: 

 part of the floor of the month, and above this th( 

 opening of the oesophagus. Pass a bristle into th( 

 former, and a probe into the latter. Notice th( 

 fine teeth in the upper jaw and on the palate. 



b. The trunk. 



Tapering towards the hinder end; and allowinj 

 the hard parts of the skeleton to be felt beneatl 

 the soft integument on the dorsal side, and in th- 

 anterior half of the ventral aspect ; rounded am 

 soft on the greater part of the sides and belly 

 the cloacal aperture near the dorsal surface of th 

 posterior end of the trunk. 



c. The limbs. 



a. The anterior pair; their three subdivisions 

 hrachium, antebracMum, and manus ; the fou 

 digits. 



/3. The posterior pair; their length as compare* 



with that of the anterior ; their subdivision int 



femur, crus, and pes: the five long digits 



the well-developed web ; the horny prominenc 



(see p. 154). 



3. Eaise the integument of the abdomen with forcep 

 and slit it open with scissors from the lower jaw t 

 the origin of the hind limbs, a little on one side c 

 the middle line. Observe the spacious lymph cavitif 

 between the skin and the subjacent muscular wall c 

 the abdomen ; also a vein which occupies the middl 

 line of the inner face of this wall and is usuall 

 visible through it. 



