926 THE AMERICAN NATURALIST. [Vor. XXXIX. 
the acetabulum into two coeca of equal length, which extend to 
the posterior extremity. 
The ovary is situated 0.15 mm. back of the 
Ph acetabulum, in the median line, is round, and 
is 0.05 mm. in diameter. The oviduct passes 
posteriorly, makes two simple coils, receives 
the vitelline duct, and is surrounded by the 
VS shell gland. It then passes anteriorly, and 
after a few turns, it opens to the exterior just 
anterior to the acetabulum, and beside the 
V  cirrus-sac. The ova are rather large, oval, 
0.09 by 0.06 mm., and from four or five to 
twenty-four were counted in one individual. 
The vitelline glands consist of a large num- 
ber of simple follicles, and extend as far an- 
I teriorly as the anterior border of the posterior 
VG testis. They are scattered over the entire 
region as far back as the ends of the intes- 
tinal coeca, and show a distinct bilateral ar- 
E . rangement. They open by two lateral ducts 
into a median receptacle, just anterior to the 
Fic. 1. — Echinostomum testis. 
en. u voter The testes are oval and relatively large, 
ide, m ae nd and located in the same antero-posterior line ; 
‚ovary; v, vitelline re- length, 0.17 mm. by 0.12 mm., and 0.03 mm. 
= "ors vieles ganz. Apart. 
The cirrus-sac and seminal vesicle lie just 
beneath the anterior margin of the acetabulum, and open to the 
exterior a short distance anterior to it. 

AS 

