S. Yoshida 
567 
sucker protrudes slightly from the bottom of the bothridium, whose 
border, in turn, is thickened, entire, and not folded. The bothridium 
contour is only broken at the anterior sucker, and its thickened margin 
is surrounded by a second thin membranous fold or velum, which 
constitutes a noteworthy character peculiar to this species. The 
head measures T6 mm. and each bothridium 0-5—0-6 mm. in diameter. 
The strobila is slender and delicate in the anterior third or fourth; 
it is widest and nearly uniform in breadth at about the middle third 
and gradually narrows in the last third of its length; anteriorly it is 
wrinkled irregularly (PI. XXIII, fig. 6). In some wrinkles—they show 
irregularity in structure—the posterior border is entire while in others 
it is slightly lobed. Over about a third of the anterior portion of the 
body length, the wrinkles gradually grow farther apart (0-07—-0-08 mm.), 
Imt they soon diminish in length. Over about two-thirds or three- 
fourths of the body length there are shght cuticular wrinkles, which 
give a serrated, pseudo-segmented, appearance to the margin. 
The slender neck gradually broadens posteriorly ; it measures 
0-03—0-36 mm. anteriorly and 0-7—0-8 mm. posteriorly. 
Anteriorly the segmentation is not visible externally but it is in¬ 
dicated internally by the cell masses of the genital Anlagen. Segmen¬ 
tation begins at a distance of 8—10 mm. from the head. The segments 
which follow rapidly increase in width, attaining a maximum breadth 
of T1 mm. at a point two-fifths or one^third along the body length. 
These broadest segments succeed each other for some distance after 
which the segments gradually taper toward the posterior end (PI. XXIII, 
figs. 7 and 8). The length of segments increases toward the posterior 
end of body, hence they vary in form from the wide rectangles in front 
to squares in the middle of the body and elongated segments behind. 
The anterior segments measure 0-2 x 0-8—0-9 mm., the widest 0-8 x 
T1 mm., whilst the posterior segments are T5—2-5 mm. in length and 
oval in cross-section (PI. XXIII, figs. 8 and 9). 
I possess many other specimens than those above described w'hich 
are slightly thicker and have shorter necks and posterior segments. 
•The genital openings are irregularly alternate, lateral, situated a 
little anterior to the middle or at the anterior third of the segment. 
The genital organs are only fully developed in a few of the posterior 
segments, but even here the eggs are not massed in the uterus. 
Male organs. The testes (PI. XXIII, figs. 8, 9 and 11, H) fill the 
space between the other genital organs in the medullary field; they 
are absent posteriorly in the segment; which is mainly occupied by the 
