PARASITOLOGY, VOL. XII. NO. 1 
P. H. Manson-Bahr del. 
Fig. 1 
Transverse section of liver of Planorbis boissyi containing large numbers of sporocysts and cercariae of 
S. mansoni, showing the proliferation of the “germ balls” from the sporocyst wall and the development 
of the cercariae from them. The small amount of normal glandular tissue remaining is well seen, 
x ca. 100 diameters. 
AL = branch of alimentary canal. 
GL = normal glandular tissue. 
