192 



S. GOTO, 



lobes of the two sides are closely applied to each other so as to 

 appear almost continuous. ■ Testes occupying two-fifths of the entire 

 length of the body, posterior to the ovary ; of moderate size 

 and numerous. The vas deferens presents a sudden expansion at 

 the level of the beginning of the paired yolk-ducts and remains 

 large up to its opening into the genital atrium. The trunks of the 

 intestine send but a few short branches towards the median line ; 

 and both end behind on the same level. Caudal disc very short. 

 Posterior suckers 10 on each side; breadth 0.055-0.072 mm. 



Habitat — Gill of Pristipoma Japonicum (Jap. Isaki). 



Locality — Mitsugahama. 



Bate — Auo:ust 1889. 



a 



6. Microcotyle fusiformis, n. sp. 

 (PL II, fig. 3 ; PL IV, fig. 6 ; PL V, fig. 1.) 



Body about 2 mm. long, symmetrical, fusiform in outline. An- 

 terior sucker with a septum. Common genital opening a little anterior 

 to midway between the hinder end of the pharynx and that of 

 the oesophagus; atrial spines small, conical, about 0.007 mm. in length. 

 The ovary when viewed from the ventral side has nearly the shape of 

 an interrogation-point; the front half large, and the hinder half 

 slender. Vaginal opening single, median, and dorsal, situated behind 

 the common genital opening two-fifths the whole distance between 

 this and the front end of the ovary. The vaginal canal con- 

 tinues single until within the last fifth of the above distance, then 

 bifurcates; and the two canals thus formed immediately become con- 

 tinuous with the paired yolk-ducts. These unite at a short distance 

 in front of the level of the origin of the oviduct, and open into it 

 just opposite the genito-intestinal canal at a short distance from the 

 beginning of the ootyp. The vitellaria of the two sides are distinct 



