GASTRODISCUS HOMINIS 149 



THE TREMATQDES OBSERVED IN MAN. 



Fare. i. Paramphistomidce, Fischoed. 

 Gen. Gastrodiscus, Lkt. 



Paramphistomidfs with bodies slender anteriorly and the posterior part 

 broadened into a disc-like form concave on the ventral surface, the 

 small ventral sucker lying at its posterior border. The pharynx has 

 two pouch-like diverticula. Gastrodiscus lives in the intestine 'of the Equidae 

 in Egypt and India as well as in man. [The species in the horse is G. son- 

 sinoi, Cobbold (G. polymastos, Leuck.). It occurs in Senegal and Quadiloupe. 

 It occurs from pharynx to anus and in the nasal fossae. F. V. T.] 



Gastrodiscus hominis (Lew. and McConn), 1876. ] 

 Syn., Amphistomum hominis, Lew. and McConn. 



The body when fresh is of a reddish colour ; it measures 5 

 8 mm. in length, 3 4 mm. in breadth, and presents a large circular 

 disc at the posterior border of which the small 

 sucker is situated (fig. 82) ; the genital pore is 

 on a level with the bifurcation of the intestine ; 

 the generative organs consist of the two lobate 

 testes, a sinuous vas deferens, the uterus, 

 and the vitelline sacs placed laterally ; parts 

 of the nervous and excretory system have also 

 been seen. The eggs are oval and measure 

 FIG. 82.Gastro- 0*150 mm. in length by 0*072 mm. in breadth. 



discus hominis, 



slightly magnified. This parasite has hitherto only been observed twice 



(After Leuckart.) i n human beings, in an Assamese and in an Indian, and 



was present in the caecum and colon in large numbers ; 



it is doubtless only incidentally a parasite of man, its normal host being 

 some Indian mammal. 



. Fam. 2. Fasciolidre, Raill. 

 Gen. i. Fasciola, L., 1758. . 



Large Fasciolidae with leaf-shaped bodies, the anterior end of which is 

 shaped into a conical head. The ventral sucker is situated near the mouth, 

 and is large and powerful. The cuticle is covered with spines ; the oesopha- 

 gus is short, the pharynx is well developed ; the intestine bifurcates near 

 the median line and extends far backwards ; the intestinal caeca are provided 

 with numerous long lateral and fewer and shorter median branches. The 

 excretory system is much ramified, and the long terminal part is 



1 Lewis, T. R., and McConnel, " A New Para. aff. Man " (Proc. Asiat. Soc., Bengal /., 

 1876, p. 182). 



