STUDIES OX THE ECTOPARASITIC TREMATODES OF JAI'AX. 99 



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backwards Ijetween the suckers, and the other enters the caudal 

 appendage and ends a little before reaching the level of the small 

 suckers at the extremity. Genital opeuimj on the same level with the 

 posterior end of the oesophagu-i, Avitliout any cliitiuous armature. 

 Oi-arij long, with numerous windings (PI. XA", fig, 1), situated near 

 the hinder end of the anterior half of the body ; of small size in 

 relation to the whole bod}-. The oviduct ])roceeds from its origin for 

 a certain distance forwards with a few v/indings, and then sharply 

 turns backwards and tow:u'ds the right, and after proceeding posteriorly 

 for a short distance, again turns shaa-ply forwards and is continued 

 into the ootijp. This is tolerably long and lies with its long 

 axis nearly coinciding with that of the body. From its front end 

 the uterus proceeds straight forwards toward the genital opening. 

 )lteU(U'ium extending from a little Ijehind tlie anterior end of the in- 

 testinal trunks to the point of their union at the level of the first 

 pair of posterior suckers ; separate in front but continuous behind. 

 Vaircl ijolh-ducts perfectly symmetrical on the two sides, arising from 

 the vitellarium at about the level of the front end of the last 

 tliird of the anterior h:df of the whole body ; proceeding at first 

 somewhat f)rwards and tsjwards the median line, then bend- 

 ing backwards, and uniting with each other in it to form a sort of 

 vitelline reservoir. From this a small uiipairal yolk-duct proceeds 

 backwards and opens int(3 the oviduct at the ])oint "where this 

 turns shar[)ly 1)ackw;u"ds towards the ootyp. The (jcnito-intcstinul 

 anal., arising from the oviduct side by side with tlie unpaired yolk- 

 duct, proceeds at first towards the right, then turns backwards 

 and finally opens into the intestine. Eeccptaculum sctninis situated on 

 the right side of the median line just in front of the ovary, large, 

 oval, with a long neck which opens into the oviduct side l)y side 

 with tlie genito-intestinal canal. Testes numerous, of moderate size ; 



