STUDIES ON THE ECTOPARASITIC TREMATODES OF JAPAX. 207 



as may be seen from a comparison of my figures of the former with 

 those of the latter iriven by Parona and PeriiGria.'^ 



IV. DiCLiDOPHORA, Diesing (ISoO). 



Body flat and of varions forms, but generally speak- 

 ing leaf-shaped ; with a pair of spherical anterior suckers 

 in the mouth-cavity and with four pairs of hemispheric- 

 al (in a surface view circular) or slightly semi-ellipsoid- 

 al suckers arranged in a semicircle or horse-shoe shape 

 at the posterior end of the body; each sucker often provid- 

 ed with a more or less long pedicel, and havin"- a 

 cliitinous, supporting frame-Avork, the general structure 

 of Avhich is represented in fig. 1, PI. XII. Intestinal 

 trunks of both sides usually uniting with each other at 

 the posterior end of the body, and besides connected with 

 each other by numerous commissural branches. Penis 

 spherical, perforated by the vas deferens, with a certain 

 number of hooks of the general shape drawn in figs. 7 &, 

 10, PI. X, and arranged in a circle. Without vagina. 



I. DicUdopliom smaris (Ijima, Ms).-^ 

 (Wood-cut 1.) 

 Synonym: Octobothri mn siixais, Ij'imn. 

 Boihj ()J-8 mm. long, separable into three parts, a slender, nar- 

 row, anterior portion, a broad, oval, leaf-shaped, middle portion, and a 



1). Parona e Perugia — Res ligusticae, YIII. Di alcimi trematodi ectoparassiti di pesci 

 mariai. Annali d. Museo Civico d. Storia Naturale di Genova. Ser. 2, vol. VII, p. 7i2. 



2). This is the species which has been supposed by Dieckhoff to be identical with Octo- 

 hothrium 2Lerlangi [l. c. p. 250). 



