PEARSE FISHES OF LAKE VALENCIA, VENEZUELA 31 



pectoral 3. The cysts are more abundant toward the posterior 

 end of the body. 



Genus Wallinia, new 



Plagiorchiidae with the genital pore median and immediately 

 anterior to acetabulum; vitellaria small and largely confined to 

 the lateral regions of the second quarter of the body; aceta- 

 bulum one-fourth to one-third greater in diameter than the 

 oral sucker, situated close behind the bifurcation of the intes- 

 tinal rami; ovary globular, small, on the left side behind the 

 acetabulum; testes rounded, arranged one behind the other 

 in the third quarter of the body, the posterior one somewhat 

 to the left of the median line, Named for Dr. Ivan E. Wallin. 



This genus differs from Pneumonoeces in the position of the 

 genital opening, the size and position of the acetabulum, and 

 from Plagiorchis in the arrangement of vitellaria, acetabulum, 

 testes, and other features. Type species Wallinia valenciae. 



Wallinia valenciae, new species 



Length, 1.34 mm. (contracted); width, .38; body widest in 

 region of acetabulum, constricted behind the oral sucker 

 (Fig. 6). Diameter of acetabulum about one-fifth the length 

 of the body; diameter oral sucker about two thirds that of 



FIG. 6. Wallinia valenciae. 



acetabulum. Genital field occupies the posterior three-fourths 

 of the body. The small spherical ovary lies somewhat' behind 

 the acetabulum on the left side. The testes are rounded; the 

 anterior one lies slightly behind the ovary near the median 

 line; the posterior testis is on the left side of the body, extending 

 to the middle of the intestinal ramus on that side. The uterus 

 is coiled in the posterior three-fourths of the body; the loops 

 are slender and filled with eggs. Size of eggs, .041 by .02 mm. 



