(ESOPHAGUS, STOMACH, AND INTESTINE :>61 



-Oe 



|r--t 



\—M 



\MD 



Fio. 210a. 



Fill. 210a.- 



FiG. 210b. 

 -Alimentaky Canal of 8ire.ii lacertina. 



Oe, (Esophagus, marked off from the stomach (J/) by a constriction, t ; P, pyloric 

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



Fig. 21 Oe. — Alimentary Canal of Jfmia escnlenta. 



Oe,'oBSophagus ; J/, stomach ; Py, pyloric region ; Du, duodenum ; D, ileum ; t, 

 boundary between the latter and the large intestine {R) ; A, opening of the 

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



In Elasmobranchs a finger-shaped rectal gland (jorocessfiis digiti- 

 formis) opens into the anterior part of the rectum, and this perhaps 

 corresponds to the cascum of higher forms (see pp. 262, 266). Traces 



