SPECIAL ANATOMY. 59 



a sort of cul-dc-sac posteriorly. Into the angle formed by the stomach 

 and intestine, on each side, opens a biliary duct, which in L. agrestiSf 

 however, is more removed toward the snudl intestines. 



Tlie 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 capacious, 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. Jlavus the intes- 

 tine, upon reaching the retractor muscles of the buccal body and eye- 

 peduncles, winds around their origin, turns backward a short distance, 

 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 backward 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 ori- 

 fice, at which it terminates by the anal aperture. 



The salivary glands are two in number, flat, oval or irregular in out- 

 line, of a grayish-pink hue, and are situated upon the anterior parietes 

 of the stomach. They are composed of several lobuli, which are con- 

 glomerated. From each gland proceeds a duct, along the oesophagus to 

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

 the oesophagus. In L. campestris the two glands are conjoined, so as 

 to form a collar around the commencement of the stomach. 



The liver, by far the largest viscus in the body, occupies a position at 

 the posterior part of the latter. It is of a brownish color, and consists 

 of two principal lobes, an anterior and a posterior, which are further 

 divided, the anterior into three or four, and the posterior into two lobes. 

 Each lobe is composed of a number of lobuli held together by blood- 

 vessels. From the convergence of branches, an hepatic duct is formed 

 for each principal lobe, which opens in the side of the angle formed at 

 the termination of the stomach in the intestine. The posterior cul-de- 

 sac of the stomach usually contains some bile, which is a thin, glairy, 

 drab-colored fluid. 



Arion. The digestive apparatus offers but little peculiarity from that 

 of Limax. The retractor muscle of the buccal body is not so strong, 

 and is divided into two lateral bands. The oesophagus is narrower 

 and longer. In the form of the stomach and absence of a cul-de-sac to 



