132 TOKIO KABURAKI 
layer of high cylindrical cells. So far as I have observed, special 
glands are altogether absent in the lining epithelium. 
Nervous System.—The exact arrangement of the nervous 
system could not be ascertained, but it seemed to be quite 
similar to that previously observed in several forms of this genus. 
Hach half of the bilobed brain-mass is continuous posteriorly 
with one of the longitudinal nerve cords, which proceed, running 
nearly parallel to each other, to the hind end of the body, and 
are connected together by transverse commissures. Lateral 
nerves are given off from the cords towards the nerve plexus, 
which lies directly beneath the superficial muscular system. 
The eye consists simply of a small pigment cup, partly filled 
with a peculiar cellular substance, whose true nature could not 
be ascertained from any of the sections available. 
Reproductive Organs.—tThe genital organs are in 
accordance with those described by von Graff. The common 
genital opening leads directly into the penis-sheath, which 
receives from behind the openings of the seminal receptacle 
(uterus) and the glandular canal. The cavity is ined with a 
single epithelium resting upon a fine basement membrane, 
beneath which are found circular and longitudinal muscular 
layers. 
Male Organs.—tThe numerous testes occur close together 
in the ventral parts of the body, arranged in two longitudinal 
lateral zones which extend from behind the ovaries to nearly the 
region of the copulatory organs. Hach testis is, as usual, made 
up of sperm-mother-cells and spermatozoa in all stages of 
development, surrounded by the tunica propria. Probably 
they are all connected by testicular ductules, but these could 
not be definitely made out. Not far in front of the penis the 
rasa deferentia rise obliquely upwards to enter the penis-bulb 
separately at the upper lateral sides and finally open into the 
lumen of the penis or the semmal vesicle. The vas deferens, 
which is filled with spermatozoa, has a wall consisting of an 
epithelium and an outer layer of circular muscular fibres. 
In the penis there can be distinguished the conical intromit- 
tent part, lying nearly horizontally in the penis-sheath, and the 
