ENTOZOA. 167 



approximate. Acetabulnm single, ventral, sessile or pedicellate. Anus at 

 termination of caudal extremity or placed dorsally. (Piesing.) 



D. lanceolaium, Mehlis. Lancet-shaped, very flat, tolerably transparent, 

 and of a whitish color. The oral sucker is proportionally larger than in 

 preceding species and about the same size as the ventral sucker; they are 

 both circular. Intestine straight, dioecious, unbranched; penis not spiral. 

 (Moquin-Taudon.) The testes form two lobed organs, placed one in front of 

 the other in the middle line of the body, and directly below the ventral 

 sucker ; the uterine canal is long, folded, occupying the central and hinder 

 parts of the body. The yolk glands cover a small space near lateral margin 

 of animal. The opening for water vascular system is terminal ; it com- 

 municates with a contractile vesicle, which passes upward, early dividing 

 into two branches, which extend as far as the base of resophagus to retrace 

 their course a considerable distance backward. (Cobbold.) 



Habitat. In the bile passages and upper portion of small intestines of 

 several mammals ; rare in man. Has been detected in sole of foot and 

 behind ear. 



Measurement. 2-6'" long; 1-2'" wide. 



D. opthalmobium, Diesing. Body lanceolate, oval form. Suckers circular ; 

 posterior farther from cephalic extremity than in the other species, being 

 nearly in the centre of the body. (Moquin-Tandon.) Intestine bifurcated, 

 as in D. lanceolatum. 



Measurements. -\'" long ; '" wide. (Diesing.) 



Habitat. Four species found by Gescheidt between the eye and its cap- 

 sule in a child five months old. Von Ammon found eight in the same position, 



D. crassum, Busk. Pointed in front, rounded posteriorly; testes form 

 two bulky, lobed organs, situated below ventral acetabulum. The uterine 

 folds occupy only the front part of the body, the margins of which also dis- 

 play two yolk glands, one on either side of the intestinal tube ; water vas- 

 cular duct rudimentary. Habitat not given. Measurements. I"6'"to3' 

 long; 8'" wide. 



D. heterophyes, Von Siebold. Body pyriform; obtusely rounded behind; 

 body compressed, armed with minute spines ; hinder sucker much larger 

 than anterior; oesophagus long; intestinal tube simple, gradually widening 

 below and terminating near posterior margin; supernumerary sucker in 

 neighborhood of reproductive orifices ; eggs red. 



Measurements. -f '" long ; \'" wide. 



Habitat. Egypt ; in small intestine of man. 



Bilharzia. 



D. hcematobia, Cobbold. Cylindrical, vermiform, 6'" long; 9 longer, 

 narrower, 10'" long; $ tuberculated and furnished with a gyncecophoric canal 

 in which the female is lodged in copulation. Intestinal canals reunite, after 

 a short separation, to form a broad, central, spirally twisted tube extending 

 down the middle of the body ; yolk- and oviducts uniting to form a single 



