116 THE SNAIL 



numerous strands of connective tissue. Their ducts, 

 •which are long and slender, run forwards and open 

 into the buccal mass, one on each side of th& 

 oesophagus. 



2, The liver is a very large bilobed gland, of a reddish- 

 brown colour, which forms a large part of the visceral 

 hump. 



a. The left lobe of the liver is the larger of the 



two, and is partially subdivided into three lobes. 

 It lies in the upper half of the first turn of the 

 spire, immediately behind the mantle-cavity, and. 

 is grooved on its outer surface by the intestine. 

 It has three main duets, which unite to open by 

 a single large aperture into the left side of the 

 stomach. 



b. The right lobe of the liver occupies the greater 



part of the second and upper turns of the spire. 

 It is separated from the left lobe by the posterior 

 end of the crop, the stomach and the commence- 

 ment of the intestine, and the albumen gland. 

 It has one large duct, which opens into the right 

 side of the stomach, almost opposite to the left 

 duct, but slightly beyond it. 



Slit up the stomach, and wash out its contents. Note the- 

 openings of the bile-ducts, and follow these with a seeker into- 

 the lobes of the liver. 



IV. DISSECTION OF THE BEPBODUCTIVE SYSTEM. 



The snail is hermaphrodite, but does not fertilise its own- 

 ova. As is usual in such cases, the reproductive organs are 

 extremely complex. 



1. The hermaphrodite gland is a small yellowish body 

 lying on the inner side of the second turn of the 

 spire, and closely imbedded in the right lobe of the 

 Uver. Within it both ova and spermatozoa are- 

 produced. 



