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UNIVERSITY OF WISCONSIN STUDIES 



FIG. 5. Parspina bagre. The upper figure shows an adult; the lower figure, 

 an encysted larva. 



between the wall of the cyst and the larva within. The 

 larva is elliptical. Its anterior end is truncated and 

 armed with twenty spines. The interior of its body shows no 

 differentiation into organs but is filled with coarse granules. 

 Larvae like those represented in Figure 5 were also found in 

 the fins of the following fishes: cula, Curimatus argenteus 

 Eigerwnann; the sardinas, Astyanax bimaculatus (L.), Creagrutus 

 beni Eigenmann, and Gephyrocharax valenciae Eigenmann; the 

 top-minnow, Lebistes reticulatus (Peters). 



The distribution of cysts in the fins is characteristic. Ten 

 Creagrutus beni collected near the Isla del Euro, July 12, had 

 cysts distributed on the fins as follows: dorsal 37, caudal 31, 

 anal 20, pelvic 17, pectoral 15, skin 1. Ten Gephyrocharax 

 valenciae collected at the mouth of the Rio Bue, July 20, gave 

 the following results: caudal 41, anal 32, dorsal 17, pelvic 5, 



