REPRODUCTIVE SYSTEM. 131 



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 OE THE REPRODUCTIVE 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 liver. Within it both ova and spermatozoa are 

 produced. 



Place a small piece of the hermaphrodite gland on a slide 

 in a drop of water : tease it slightly : cover : and examine 

 with low and high powers. 



The gland consists of a number of finger-like 

 follicles, in each of which ova are developed in the 

 outer wall, and spermatozoa in the more central 

 part. The ova are large round granular cells, with 

 very large reticulate nuclei : the spermatozoa, which 

 are generally aggregated in wisp-like bundles, have 

 small rod-like heads and very long tails. 



2. The hermaphrodite duct is a very sinuous duct, of a 



whitish colour, lying along the inner side of the 

 spire close to the columella, and opening into the 

 inner side of the albumen gland. 



