34 UNIVERSITY OF WISCONSIN STUDIES 



posterior margin of the acetabulum. Uterus short, coiled 

 somewhat posterior to acetabulum. None of the specimens 

 examined contained eggs. Genital pore in the median line 

 immediately anterior to the acetabulum. Cirrus sac elongated, 

 pear shaped, eleven-fourteenths as long as diameter of acetabu- 

 lum. 



Testes lobate, the anterior one somewhat on the left of the 

 median line, the posterior one somewhat on the right. Vitel- 

 laria small, ellipsoidal, arranged in a V-shaped area outside 

 the intestinal rami and across the posterior end of the body. 

 Intestinal rami smooth, slender (diam. .02 mm.) extending to 

 within one-seventh of posterior end of body. 



Host: Chusco, Aquidens pulcher Gill, in intestine. 



Type: Cat. No. 7562 (Helm. Coll. U. S. N. M.); collected 

 in mouth of Rio Bue, near Maracayj Lake Valencia, July 19, 

 1918. 



TREMATODE No. 2 



Forty trematodes of this species were found in the intestine 

 of a cula, Curimatus argenteus Eigenmann, caught at the 

 mouth of the Rio Bue, July 20, 1918. The specimens were 



FIG. 9. Trematode No. 2. 



not in good enough condition for complete study. Figure 9 

 shows the general form of the body; the length of which was 

 .35 ,mm. The suckers are nearly equal in size. The genital 

 pore is close to the anterior border of the acetabulum. 



