174 



THE ANIMAL PARASITES OF MAN 



Ms. 



Cb. 



the cirrus pouch, situated in front of the ventral sucker, contains the 

 vesicula seminalis. The testes have either smooth or serrated borders, 

 and lie symmetrically or obliquely next to or behind the ventral sucker 



The ovarium approaches the median line 

 and is behind one testis. Laurer's canal 

 and receptaculum seminis are present. The 

 uterus lies behind the sexual glands and 

 spreads to the posterior border. The vi- 

 tellaria in the lateral areas are small. 

 The ova are mostly dark brown and nu- 

 merous. The excretory bladder is tubular 

 in form. The worm lives parasitically in 

 the liver and gall-bladder (rarely in the 

 intestine) of members of all classes of ver- 

 tebrate animals by preference in birds and 

 mammals. 



Dicroccelium lanceatum, Stil. and 

 Hass., 1896. 



Syn. : Fasciola lanceolata, Rud., 1803 (nee 

 Schrank, 1790) ; Distomum lanceolatum, 

 Mehlis, 1825 ; Dicroccelium lanceolatum 

 Dujardin, 1845. 



The body is pointed at both ends, 

 but is particularly narrow at the an- 

 terior extremity ; the length of the 

 body averages 8 10 mm., the breadth 

 is from 1*5 2*5 mm., the greatest 

 breadth usually being behind the 

 middle of the body. Suckers distant 

 from each other by about one-fifth 

 the length of the body ; the oral 



FIG. 106. Dicroccelium lanceatum, Slir i,.p r measures ahnnt O'i the ventral 

 Stil. and Hass. 15/1. V.s., Ventral 5 ' l 



sucker; Cb., pouch of cirrus ; /., sucker about 0'6 mm. The pharynx 

 "T"^ : ; C ^! is globular and adjoins the oral 

 Ms., oral sucker ; ut., uterus. sucker ; the cesophagus measures 0*6 



mm. in length ; the intestinal branches 



occupy four-fifths of the body. The genital pore is at the level of 

 the bifurcation of the intestine ; the cirrus pouch is small and 

 slender. The large, slightly lobate testicles lie obliquely one at 

 the back of the other behind the ventral sucker, and the ovarium, 

 which is considerably smaller, is placed behind the posterior one ; 

 the vitellaria, commencing at the level of the posterior testicle, 



