208 INTRODUCTION. 
ducing, in L. variegata and L. campe&tris, a sort of cul- 
de-sac posteriorly. Into the angle formed by 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 
