HETEROPHYES HETEROPHYES 



263 



Length up to 2 mm., breadth 0-4 mm. ; the neck not sharply defined ; 

 in life it stretches to double the length of the hind body. The scales 

 are rectangular, 5 //, to 6 //, by 4 //,, their posterior margin serrate with 

 seven to nine teeth. Cuticular glands are numerous on the ventral 

 surface, especially in the fore part of the body, and partly discharge 

 at the anterior border of the oral sucker. The oral sucker is 0-09 mm., 

 the ventral sucker 0*23 mm. in diameter ; the pharynx measures 

 0*05 to 0*07 mm. in length ; 

 the oesophagus is about 

 three times as long ; pos- 

 teriorly the intestinal caeca 

 are directed one towards 

 the other and terminate 

 beside the excretory 

 bladder. Close in front 

 of the posterior ends of 

 the intestinal branches are 

 the two elliptical testes, 

 which are not exactly on 

 the same level. In the 

 middle in front of them is 

 the receptaculum seminis, 

 and in front of the latter 

 lies the spherical or ellip- 

 tical ovary. The two vasa 

 efferentia unite to form the 

 vas deferens, which after 

 a short course passes over 

 into the angularly bent T. 



seminal vesicle ; after the 

 entry of the prostatic 

 glands it becomes united 

 with the metraterm 

 (vagina), and the common 

 duct opens into the genital 

 sucker. The latter is some- 

 what smaller than the ven- 

 tral sucker, lateral to and 



close (0*15 mm.) behind it, and bears a not entirely closed ring of 

 from seventy- five to eighty chitinous rods (20 p in length). The vitel- 

 laria on either side consist of about fourteen acini. The uterus is 

 spread almost throughout the entire posterior part of the body. The 

 eggs have thick shells with a knob resembling that of Clonorchis eggs 

 but not so prominent, and measure 30 p by 17 //, ; they contain a 

 completely ciliated miracidium with a rudimentary intestinal sac. 



L.c. 



K.s. 



T. 



FIG. 163. Heterophyes heterophyes, v. Sieb. 

 C., cerebral ganglion; /., intestinal caeca; Ct.g., 

 cuticular glands ; V.sc., vitellaria ; Ut., genital sucker ; 

 T., testes the excretory bladder between them ; L.c., 

 Laurer's canal ; fi.s., receptaculum seminis, wiih the 

 ovary in front of it ; G.c., ventral sucker ; Vs., vesicula 

 seminalis, 53/1. On the left side above, an egg, 700/1, 

 is depicted, and below it three chitinous rodlets from the 

 genital sucker. 700/1. (After Looss.) 



