32 



UNIVERSITY OF WISCONSIN STUDIES 



The vitellaria are small and lie outside the intestinal rami in 

 the second quarter of the body. The genital pore is crowded 

 into the triangular space between the anterior margin of the 

 acetabulum and the intestinal rami. 



Host: Gephyrocharax valenciae Eigenmann, in intestine. 



Type, Cat. No. 7569 (Helm. Coll. U. S. N. M); collected 

 from a fish taken in Lake Valencia at Maracay, in shallow 

 water among rushes, July 24, 1918. 



The following species is placed in the genus Allocreadium 

 Looss, although it appears to differ from other members of 

 that genus in possessing a shorter esophagus and in the position 

 of the genital aperture immediately anterior to the acetabulum. 



Allocreadium wallini, new species 



Length, 1.55 mm.; width, .74 mm.; body widest behind 

 middle (Fig. 7). Oral sucker and acetabulum approximately 

 equal in diameter. Ratio of diameter of oral sucker to that of 

 pharynx about 7:3. A short prepharynx is present. Intestinal 

 rami smooth, branching directly from pharynx, extending to 

 posterior fifth of body. Cuticula is without spines. 



FIG. 7. Allocreadium wallini. A, a young individual; B, a mature individual 

 with eggs in the uterus. 



