24 ^rt. 4.— T. Kaburaki : 



pharyngeal chamber, in which is disposed the phcated pharynx. 

 The gut trunks are provided with numerous bifurcated branches, 

 the epithehum of wliich is made up, as usual, of higher columnar 

 cells. 



The structure of the genital apparatus is in accord with that 

 described by von Graff. The common genital opening leads into 

 the vestibulum, which forms a wide, annular, oblique, upwardly 

 directed outbulging, and which receives the openings of the penis- 

 sheath as w^ell as of the glandular organ. The vestibulum is lined 

 with a single epithelium, Ijeneath whicJ] is a muscular coating 

 composed of circular and longitudinal fibres. 



Numerous testes are arranged on eitlier side of the antei'ior gut 

 trunk, extending from behiiid the ovary to the insertion of the 

 pharynx. The vasa deferentia, proceeding backwards just along 

 the upper side of the longitudinal nerve cords, turn abruptly round 

 at the sides of the penis and then pursue a directly opposite course, 

 to enter the penis-bulb at its anterior end. Within the bulbous 

 part they unite into a common duct before opening into the semi- 

 nal vesicle. The vas deferens, whicli is filled with spermatozoa, 

 shows a definite wall consisting of a thin epithelium and a feeble 

 muscular layer of circular fibres. 



The penis is composed of the spherical bulbous part of muscular 

 nature and the small, conical intromittent part which is nearly 

 horizontally disposed in the penis-sheath. Enclosed in the former 

 part is a wide cavity, the seminal vesicle, which is lined witli 'an 

 epithelium of a glandular nature, projecting to a considerable extent 

 into its lumen in folds. I'osteriorl}^ the vesicle is continuous with 

 the ejaculatory duct which opens into the penis-sheath at the tip 

 of the penis. Externally the penis is covered with a thin epithe- 

 lium. The muscular fibres of which the penis is composed are 

 arranged in two principal sets, circular and longitudinal, the filtres 

 of the two sets occurring intermingled with one another. 



The penis-sheath leads into the vestibulum, through the 

 tubular passage which is richly ciliated. The wall of the sheath 

 ■consists of a non-ciliated epithelium and a thick muscular coating, 

 much as observed in the vestibulum. 



