208 INTRODUCTION. 



ducing, in L. variegata and L. campestris, a sort of cul- 

 de-sac posteriorly. Into the angle formed bj the stomach 

 and intestine, on each side, opens a biliary duct, "which, 

 in L. agrestis, however, are more removed toward the 

 small intestines. 



The intestine forms a single convolution among the 

 lobes of the liver, and then passes obliquely forward from 

 the left to the right side, to join the rectum. It is capa- 

 cious, and pretty uniformly cylindrical throughout. 



About the middle of the oblique portion going to join 

 the rectum, in L. agrestis, opens a short, cylindrical cul- 

 de-sac. In L. variegata the intestine, upon reaching 

 the retractor muscles of the buccal body and tentacles, 

 ■winds around their origin, turns backward a short dis- 

 tance, and then again forward to the rectum, producing 

 in this way a sigmoid flexure. From the termination of 

 the latter in the straight portion, there proceeds back- 

 ward as far as the termination of the visceral mass, a 

 long, cylindrical cul-de-sac. 



The rectum is short and straight, and penetrates into 

 the pulmonary cavity, upon the right side of which it 

 proceeds to the pulmonary orifice, at which it terminates 

 by the anal aperture. 



The salivary glands are two in number, flat, oval or 

 irregular in outline, of a grayish pink hue, and are situ- 

 ated upon the anterior parietes of the stomach. They 

 are composed of several lobuli, which are conglomerated. 

 From each gland proceeds a duct, along the oesophagus 

 to the buccal body, into which they open on each side of 



