J 2 Elementary Zoology. 



spermatozoa and ova. This is connected by a duct with a 

 large gland, the albumen gland. Some time after this the 

 common duct divides into a vas deferetis and an oviduct To 

 each separate duct a system of glands and diverticula is 

 appended, which are illustrated in the figure (Fig. 32). The 

 snail deposits its ova in the earth ; the embryos have, as is 

 usual with terrestrial animals (to which, however, there are 

 plenty of exceptions, e.g. insects), no free larval stage. 



