NO. 3 manter: a new genus of distomes 13 



posterior end of the body where they are obvious in toto-mounts. 

 Posterior to the testes each of the four vessels spUts to form two 

 making a total of four pairs. Each vessel is much branched, the ends 

 of the branches extending to near the edge of the body. These tips 

 are often swollen (plate 2, fig. 2). 



The genital pore is median close to the anterior edge of the 

 acetabulum. The testes are more or less rectangular in outline, 

 slightly lobed, tandem, close together, approximately in the middle 

 of the body. Except in young individuals (where the testes are of 

 about equal size) there is a distinct tendency for the anterior testis 

 to be wider than long, smaller and less lobed while the posterior 

 testis tends to be longer than wide, larger and more deeply lobed. 

 The posttesticular space is very long, sometimes more than Yz body 

 length. A large, elongated sac-like seminal vesicle occurs immediate- 

 ly posterior to the acetabulum and overlapping the ovary. Anter- 

 iorly it narrows into a fine tube which continues without modifica- 

 tion to near the anterior edge of the acetabulum where it joins the 

 uterus to form a simple tubular genital sinus. Prostate gland cells 

 are lacking unless represented by a few scattered cells around the 

 male duct. A cirrus and cirrus sac are lacking. The narrow straight 

 tube from seminal vesicle to genital pore is not muscular and since 

 the pars prostatica cannot be distinguished from a cirrus portion, 

 the tube might be termed the ejaculatory duct. It seems to have the 

 same structure after its union with the uterus to form the ductus 

 hermaphroditlcus or genital sinus. 



The ovary is spherical, midway between the anterior testis and 

 the acetabulum, slightly to the right, just median to the right cecum. 

 Mehlis' gland is well-developed, lying between ovary and anterior 

 testis. A large flask-shaped seminal receptacle extends anterior to 

 the ovary almost to the acetabulum. Laurer's canal is well-develop- 

 ed, coiled, and opens dorsally at mid-ovary level. The uterus is pre- 

 testicular filling most of the area between testes and acetabulum, 

 wholly to the left of the ovary and largely to the left of midbody 

 axis. It becomes a straight tube dorsal to the acetabulum and joins 

 the male duct near the anterior edge of the acetabulum. The eggs 

 are fairly thin-shelled, 61 to 67 by 31 to 34 ;u. The vitelline follicles 

 extend from the level of the ovary to near the posterior end of the 

 body. In 13 specimens studied the follicles reached the posterior 

 border of the acetabulum In 2 (In which the ovary also was far for- 



