150 Wisconsin Academy of Sciences, Arts, and Letters. 
Sixteen specimens of this trematode were taken from the intes¬ 
tine of a mooneye canght in Lake Pepin, June 25, 1920. Two 
other mooneyes were captured at the same time. One contained 
twenty-one of the parasites; the other, none. 
Allocreadium armatum MacCallum 
(Fig. 8) 
Length of a large contracted specimen, 3.2 mm. (U. S. Nat. 
Mus., Cat. No. 7620); width, 1.08 mm.; diameter of oral sucker, 
.35 mm.; diameter of acetabulum, .6 mm.; egg, .11 by .07 mm. 
Length of a smaller expanded specimen, 2.8 mm.; width, .53 mm. 
Cuticle minutely denticulate, especially toward the anterior end. 
The diameter of the oral sucker is nearly two-thirds that of 
the acetabulum, which is situated at the posterior end of the an¬ 
terior third of the body. A short prepharynx is present. The 
pharynx is about half the diameter of the oral sucker in length, and 
it is about as wide as long. The intestinal rami are slender and 
reach nearly to the posterior end of the body. 
The ovary is about half as long as the anterior testis and oval, 
with the long axis extending across the body. It lies on the right 
side of the body just behind the acetabulum. The uterus is coiled 
between the acetabulum and the anterior testis, lying mostly on 
the left side. It may contain as many as eleven eggs. The genital 
pore is on the median line anterior to the acetabulum. The vitel¬ 
line glands surround the intestinal rami in the posterior third of 
the body and extend forward outside the rami nearly to the 
middle of the acetabulum. 
The two testes are somewhat lobate and are slightly elongated; 
their long axes lying across the body. They lie close together 
immediately posterior to the ovary between the intestinal rami, 
one being directly behind the other. The posterior testis is slightly 
larger than the anterior. The cirrus pouch is oval, about a third 
as wide as long, and is about as long as the diameter of the 
acetabulum. 
Sixty-five specimens were taken from a sheepshead, Aplodinotus 
grunniens Kafinesque, caught in Lake Pepin, Wisconsin, July 9, 
1920. Other specimens were taken from the same locality and 
species on July 10, 13; from sunfishes Eupomotis gihhosus (Lin¬ 
naeus) at Sturgeon Bay, Wisconsin, July 19, 23. 
