STUDIES ON THE ECTOPARASITIC TREMATODES OF JAPAN. 207 



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

 those of the latter given by Parona and Perugia.'^ 



IV. DiciJDOPHORA, Diesing (1850). 



Body flat and of various 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 having a 

 chitinous, supporting frame-work, the general structure 

 of which 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. 



1. Diclidophora smaris (Ijima, Ms).'^ 

 (Wood-cut 1.) 

 Synonym : Octobothrium smaris, Ijima. 

 Body 6^-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, VIII. Di alcuni trematodi ectoparassiti di pesoi 

 marini. Anuali d. Museo Civioo d. Storia Naturale di Genova. Ser. 2, vol. VII, p. 742. 



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

 botlirium Merlangi {I. c. p. 250). 



