240 DR. R. T. LEIPER ox [Feb. 1, 



The gut-branches have a width of 0*06 mm. and follow a wave- 

 like course to end at the level of and ventral to the testes. 



The genital opening lies immediately, behind the pharynx and 

 discharges into the narrow channel leading into the ventral pouch. 

 It lies in front of the bifurcation of the gut. 



The genital atrium is 0*1 mm. deep and Ol mm. wide. 



The testes are small rosette-like bodies lying one on either side 

 of the middle line in the pad of parenchymatous tissue that inter- 

 venes between the blind end of the ventral pouch and the dome 

 of the ventral sucker. They measure in my immature specimens 

 0*2 mm. in diameter. The various parts of the genital tube can- 

 not be satisfactorily delimited as the worm had not reached sexual 

 maturity. 



The yolk-glands are undeveloped in the specimens. 



The ovary rests upon the fundus of the excretory vesicle on 

 the connective tissue between the ventral pouch and the dorsum. 



The shell-glands are undeveloped ; their rudiment lies just 

 ventral to the ovary. 



The uterus contains no eggs. 



Laurer's canal crosses over the fundus of the excretory vesicle 

 to open opposite its centre. 



Excretory vesicle is a large egg-shaped cavity 0-6 mm. in length 

 by 0'3 mm. in breadth, lying with its longitudinal axis parallel to 

 that of the body. Its posterior more pointed half rests upon the 

 dorsal surface of the ventral sucker. The excretory duct is very 

 short (0"07 mm.) and passes diagonally from the excretory vesicle 

 to the dorsal surface. The excretory pore lies at a distance of 

 0*36 mm. behind Laurer's canal, which curves over the fundus of 

 the vesicle. 



Genus Paramphistomum. 



6.' Paramphistomum gigantocotyle Brandes. (Text-fig. 30.) 



Otto and Buchner have previously found this species in small 

 numbers, but only the former has given any account of the 

 parasite. Otto's description is very incomplete, and on some 

 points is apparently incorrect. JSTo mention is made of the 

 pharyngeal pouches, or of the openings of Laurer's canal and 

 excretory vesicle. He states that there is only one testis. I 

 attribute my specimens to this species mainly on the ground of 

 the presence of an exceedingly large ventral sucker. 



Form, etc. — The body is pyriform, the anterior being the pointed 

 end. It measures 8 mm. in length and 2*75 mm. in greatest 

 diameter. The dorsal surface is markedly convex, and the large 

 ventral sucker presents entirely on the ventral aspect of the body. 

 This sucker has an antero-posterior internal diameter of no less 

 than 3*2 mm., and its wall is 0'4 mm. in thickness. The opening 

 of the sucker varies considerably in size in different specimens : in 

 well-preserved ones its usual diameter is about 1*6 mm., in 

 macerated worms it may exceed even 4 mm. 



