200 



S. GOTO. 



3. Axine trianriularis, n. sp. 

 (PI. VII, figs. 7 & 8.) 

 Bodij about 1.5 mm. long, flat, broad, and triangular, with an 

 almost straight posterior border. Common (jenital opening close 

 behind tlie termination of the oesophagus. Ovary at about the an- 

 terior end of the last third of the whole body ; form like that of 

 an interrogation-point when looked at from the ventral side. Oviduct 

 arising a little on the right side of the median line ; and thence pro- 

 ceeding backwards Ls swollen into a receptaculum seminis, which is 

 wound spirally once on itself. Beyond the seminal receptacle the 

 oviduct again proceeds backwards, and after receiving the genito- 

 intestinal canal, bends towards the left, and at the same time proceed- 

 ing posteriorly, is continued into the ootyp on the median line of the 

 body just in front of the testes. From the ootyp the titeriis proceeds 

 along the median line towards the genital atrium. Vitellarium of each 

 side distinct both in front and behind, extending from the level of 

 the common genital opening to near the posterior extremity of the 

 body. Paired yolk-ducts arising a short distance in front of the anterior 

 end of the ovary and soon uniting with each other on the medkn 

 line. The unpaired yollc-diict proceeds backwards along the median line 

 and bending towards the right at the level of the ootyp opens into the 

 oviduct at a short distance from where the latter receives the genito- 

 intestinal canal. Testes rather small, only about 12 in number. 

 Genital atrium with a cii'cular, cup-shaped organ like that of Microcotylc 

 cluri, the diameter of which is about 0.035 mm., and the internal 

 surface of which is covered with conical spines. Oesophagus exceedingly 

 short. Intestinal tninlcs sendino; out numerous bifurcatino' branches on 

 the outer side, but only shallow evaginations on the inner. Suckers 

 about 36 on one side and only 6 on the other ; breadth 0.04-0.06 mm. 



