232 



COMPARATIVE ANATOMY. 



food, which are swallowed whole, it is capable of great distension. 

 In these forms the intestine is only slightly coiled ; in Lizards the 



Oe 



r-t 



-Oe 



L-Jf 



-Mss 



FIG. 189. FIG. 190. 



FIG. 189. INTESTINAL TRACT OF Siren lacertiua. 



Oe, oesophagus, marked off from the stomach (M) by a constriction, t ; P, pyloric 

 region ; MD, small intestine ; ED, large intestine. 



FIG. 190. INTESTINAL TRACT OF Rana esailenta. 



Oe, oesophagus ; Af, stomach ; Py, pyloric region ; Du, duodenum ; D, ileum : t, 

 boundary between the latter and the large intestine (.ft) ; A, opening of the 

 rectum into the cloaca (Cl) ; Hb, urinary bladder ; Mz, spleen. 



coils are more marked, and in the other forms, with broad bodies, 

 the folding is carried still further. 



