ON SOME (lUEENSLAND 'I’li KMATODES. 
385 
The excretory pore opens at the posterior end^ generally 
into a more or less deep depression. The vesicle is long and 
voluininons, extending as a wide straight tube as far forwards 
as the receptacnlnm seminis. Here it divides into two com- 
paratively narrow vessels which runs forwards near the inner 
sides of the intestinal limbs and end blindly near the anterior 
end. From these vessels a number of capillary branches are 
given off. 
The genital pore lies in the middle line^ in front of the 
ventral sucker, and very close to its opening; in most cases 
almost on its lip. The testes lie in two parallel rows close to 
the inner border of the intestinal limbs. They are not only 
variable in number, but also unequal in number on the two 
sides. In eleven mounted specimens there were nine with 
five on the left side and six on the right; one specimen had 
three on the left and five on the right, while another had two 
on the left and three on the right. The two latter were not 
small nor immature, but amongst the largest of those present. 
The testes are not divided into double dorso-ventral rows 
like those of P. poly orchis Stoss., described by Linton in 
26 , p. 460. Each testis is round and smooth, 0‘476 mm. in 
diameter. The vesicula seminalis, lying close behind the 
ventral sucker, is large and pear-shaped. The ejaculatory 
duct, surrounded by a well-developed prostate, skirts round 
the left side of the ventral sucker, and, near its anterior 
border, opens into a tubular genital sinus. The latter, leading 
directly to the genital opening, in the form of a cylindrical 
tube, is 0'24 mm. long. There appears to be no cirrus sac; 
but the vesicula seminalis and the ejaculatory duct and 
prostate lie free in the body parenchyma. 
The ovary is a smooth spherical body, 0’o7 mm. in diameter, 
lying a little to the right of the middle line, near the anterior 
end of the testes. To its left is a large shell-gland,^’ and 
behind it a capacious receptaculum seminis. There is a 
Laurer’s canal with comparatively thick walls. The uterus, 
running out laterally from the left side of the shell-gland,” 
is a comparatively small tube which reaches the level of the 
