210 INTRODUCTION. 



buccal body. The retractor muscle of the latter is split 

 into two bands as in Arion, but one stronger. There are 

 also two small retractor muscles to the lower lip. The 

 oesophagus is comparatively long. The stomach is cylin- 

 drical and sacculated, and, posteriorly with the small 

 intestine, forms a wide cul-de-sac. The small intestine 

 is like that of L. cmnpestris and Arion. The salivary 

 glands occupy a position on each side of the oesophagus. 

 The ducts are tortuous. 



Vaginula. The buccal body possesses no retrac- 

 tor muscle. The dental plate is broad, and, upon the 

 anterior surface, has a pectinate appearance, from the 

 numerous ridges upon it. Its cutting edge is devoid of 

 the conical toothlet. The oesophagus is moderately long 

 and capacious. The stomach is cyhndrical and saccu- 

 lated, and posteriorly forms a deep, capacious cul-de-sac, 

 independent of the small intestine. It is strongly mus- 

 cular and shining, the transverse muscular fibres being 

 very distinct. The anterior hepatic duct opens into the 

 angle formed by the cul-de-sac and the intestine, the 

 posterior into the fundus of the latter. The small intes- 

 tine is pretty uniformly cylindrical, and holds the usual 

 course to near its termination in the rectum, Avhen to 

 reach the latter it turns abruptly backward, and joins it 

 on the right side, just posterior to the middle of the 

 body. The rectum is straight, and proceeds backwards, 

 along the right side of the body, within the pulmonary 

 cavity, and terminates between the extremity of the tail 



