FASCIOLOPSIS BUSKI 



159 



Fasciolopsis buski (Lank.), 1857. 



Syn. : Distomum buski, Lank., 1857; Dist. crassum, Busk, 1859, nee 



v. Sieb, 1836. 



The length of the body varies ; it may measure 24 37 or even 

 attain 70 mm. ; the breadth is from 5-5 to 12 14 mm. The oral 

 sucker measures o - 5 mm. in diameter, the ventral sucker is three 

 to four times as large ; the pharynx is globular, 0*7 mm. in diameter ; 

 the prepharynx is provided with a sphincter ; the intestinal 

 branches extend to the posterior border. The genital pore is at 

 the anterior border of the ventral sucker ; the tubular cirrus 

 pouch is about one-fourth of the length of 

 the body. The ovary and shell glands are 

 situated in about the middle of the body with 

 the testes behind them, and the uterus in 

 front. The vitelline sacs extend from the 

 ventral sucker to the posterior border. The 

 eggs measure 0-12 0*130 mm. in length and 

 '77 '8 mm. in breadth. 



This species has hitherto only been ob- 

 served in the intestine of man, and then 

 only in East and South Asia (Budd, Lan- 

 kester, Leidy, Cobbold, Odhner). seven cases 

 representing the total. 



Distomum rathouisi, Poirier, 1887 



, 



is related to the above but not identical 

 with it. It measures 25 mm. in length, by 



FIG. 91. Distomum 

 rathouisi (Poir.). The 

 mouth at the top, and 

 under it the genital pore 

 and ventral sucker, behind 

 which again is the uterus. 

 The vitelline sacs are at 

 the sides, and posteriorly 



, 



1 6 mm. in breadth, and the contour is oval in the central field the 

 with a slightly prominent head cone; the [ s a fi fronf of 'tte dgM 

 cuticle has no spines, the suckers are near one. (After ciaus.) 

 to each other, the oral sucker measuring 



i -5 and the ventral sucker 2 mm. in diameter. The intestines 

 have no lateral branches ; the testes and ovary are situated in the 

 posterior half of the body, the branched testes are side by side, 

 the ramified ovary is in front of one testis and behind the trans- 

 verse vitello duct. The vitelline sacs occupy almost the entire 

 sides, of the body and do not meet at the back. The uterus is 

 in the central field of the anterior half of the body. The genital 

 pore is close in front of the ventral sucker. Eggs 0-15 o - 8o mm. 

 Hitherto this parasite has only been observed once in a Chinese 



