PEARSE FISHES OF LAKE VALENCIA, VENEZUELA 



37 



TREMATODE CYST No. 3 



On July 27, 1918, a mataguaro, Crenicichla geayi Pellegrin, 

 which had several trematode cysts in its fins and beneath 'its 

 skin, was caught in the Rio Castano. The cysts -all had the 

 form shown in Figure 12. The cyst wall was thick but had no 

 definite outer boundary the fibers composing- it blending 

 gradually into the surrounding tissues. There was much more 

 pigment about the cysts in the fins than about those beneath 

 the skin. The larva within the cyst measured .28 Jby .16 mm.; 

 the cyst about .6 by .5 mm. The diameter of the oral sucker 

 is about one-eighth and the acetabulum somewhat more than 

 one-fourth the length of the body. 



This cyst was not found in mataguaros from Lake Valencia. 

 It was abundant in two mataguaros caught in the Rio Castano, 

 July 27. One specimen had the cysts distributed about as 

 follows: dorsal 60, caudal 30, anal 60, pelvic 90, pectoral 60. 

 The other had none in the fijis but carried about forty in its 

 skin. 



CESTODA 



No adult tapeworms were found in the fishes of Lake 

 Valencia. The larvae collected probably have their adult 

 stages in birds or in other fish-eating animals. 



FIG. 13. Tapeworm cysts found in Vajencian fishes. 



