172 



THE ANIMAL PARASITES OF MAN 



the ovary in a median position between them. Laurer's canal with re- 

 ceptaculum seminis present ; the small vitellaria are at the sides of the 

 posterior part of the body. It lives in the intestine of mammals and 

 birds. 



Cotylogonimus heterophyes (v. Sieb.), 1852. 



Syn. : Distomum heterophyes, v. Siebold, 1852 ; Mesogonimus heterophyes, 

 Rail!,, 1890; Coenogonimus heterophyes, Looss, 1900. 



This parasite reaches up to 2 mm. in length and i mm. in 

 breadth ; the neck is not sharply constricted off ; in life it 



stretches to double the 

 length of the 



-e.g. 



Ct.g. 



G.c. 



body. 



The scales are rectan- 

 gular. O'OO5 - o - oo6 : 

 0*004, tn d r posterior 

 margin serrate with 7 

 to 9 points. The cu- 

 ticular glands are nu- 

 merous on the ventral 

 surface, especially in the 

 forepart of the body, 

 and partly discharge at*., 

 the anterior border of 

 the oral sucker. The oral 

 sucker is cri, the ventral 

 sucker 035 mm. in diam- 

 eter ; the pharynx meas- 

 ures O'05 0-07 mm. in 

 length ; the oesophagus is 

 K ' s ' about three times as long ; 

 posteriorly the intestinal 

 branches are directed one 

 towards the other and 

 P , . terminate next to the 



FIG. 105. Cotylogonimus heterophyes (v. Sieb.) 



53/1. C.g., Cerebral ganglion ; /., intestinal excretory bladder. Close 



branches ; Ct.f>., cuticular glands ; V.sc., vitelline f rrmt n f f u p nnstprinr 

 sacs ; G.C., genital cup ; T., testes the excretory 



bladder between them ; L.c., Laurer's canal ; R.s., ends of the intestinal 



receptaculum seminis, with the ovarium in front i. i, u 



of it ; Ut., uterus ; V.s., vesicula seminalis. On Drancnes are two 



the left side above, an egg, 700/1, is depicted, elliptical testes, which are 

 and below it three chitinous rodlets from the J . 



genitai cup, 700/1. (After Looss.) 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 spheroidal or elliptical ovarium. The two vasa efferentia 



T. 



