E. C. Faust 
215 
DISCUSSION. 
With the larval stages of the more common species of flukes established 
for this portion of South Africa, the next problem in hand involves the dis¬ 
covery of the adult flukes in the same locality, flukes which possess gross 
Fig. 1. Ventral view of Cercaria pigmentosa, showing digestive and reproductive systems, x 57. 
Fig. 2. Ventral view of Cercaria 30 -acanthostoma, showing digestive and excretory systems, 
x 115. 
Fig. 3. Dorsal view of collar spines of Cercaria SO-acanthostoma. x 115. 
Fig. 4. Integumentary spines of Cercaria SO-acanthostoma. x 242. 
characters showing likely correlation with these larvae. It must be held in 
mind continually that many of the larval organs are IcitvciI only and disappear 
with metamorphosis; likewise, that some of the adult structures are not 
