STUDIES OX THE ECTOPARASITIC TREMATODES OF JAPAN. 209 



Oesophagus short ; anterior portion of tlie intestinal trunk destitute 

 of lateral branches, but the remaining portion sending out numer- 

 ous lateral l)ranches ])oth inwards and out\Yards ; those of the 

 inner side posterior to tlie ovary uniting with those of tlie opposite 

 side and forming C(^mmissures. From the point of union of the two 

 intestinal trunks a single median trunk proceeds backwards ; this, 

 however, is very short and soon breaks up into a few secondary 

 branches. Common (joiital opening situated about ^ mm. behind 

 the mouth ; penis with six hooks of the usual shape in this genus. 

 Ovcmj situated in the median line, about the middle of the whole 

 length of the body, long, bent on itself by its middle, and the whole 

 curved, the long axis of the ovary roughly coinciding with that 

 of the body. Oviduct arising from the anteri(3r end of tlie ovary on 

 the riii-ht side of the bodv, tlience proceeding- backwards and, curvinir 

 inwards toward the median line, is continued into the ootyp, whir-h 

 is situated in the median line of the body just in front of the posterior 

 end of the ovary. From the ootyp the uterus proceeds straight 

 forwards. Goiito-iutestinal canal rather short, opening into the 

 oviduct half as far frtjm the beginning of the oviduct as from the 

 ootyp, thence proceeding towards the right, and finally opening 

 into the intestine. Vitellaria of the two sides distinct in front 

 but continuous behind. ruired yollc-ducts of the two sides 

 symmetrically disposed at right singles to the long axis of the 

 bod}^, and uniting with each other in the median line. Unpaired 

 7jolk-d2ict opening into the oviduct aljout halt as fu' from the <3otyp 

 as from the opening of the genito-intestinal canal into the ovi- 

 duct. Testes numerous, all situated behind the ovar}^ ; vas de- 

 ferens running dorsal to the uterus and usually making scnne 

 convolutions. 



