S. Yosiiida 
561 
2—3 X 2-5—4 mm. Bothridial border strongly folded appearing like 
a cauliflower. The head agrees well both in size and in shape with 
the figure given by van Beneden (1850). Neck tolerably long, broad¬ 
ening posteriorly; 10—20x0-5—hi mm.; the surface bears numerous 
transverse wrinkles which give rise to an appearance of segmentation. 
Strohila short, thick, oval in cross section. The breadth of segments 
increases gradually towards the posterior end, reaching a maximum 
near the posterior extremity where it measures 2-7—5-0 mm.; thence 
it gradually tapers caudally. The length of the segments also gradually 
increases posteriorly, reaching a maximum in the last segment which 
is 0-8—1-5 mm. long. The dimensions of various parts of body are 
as follows (in mm.); 
First Middle Maximum Last 
Head Neck segment segment segment segment Total 
Length 2—3 10—20 very short 0-3—0-5 0-3—0-6 0-8—1-6 60—80 
Breadth 2-5-^-0 0-5—1-1 1-5—2-0 2-7-^-6 2-7—5-0 1-5—2-0 
The worm is very thick, especially in mature segments in which the 
uterus is distended by. eggs. The posterior third or fourth of the 
strobila is atrophied, as the result of the discharge of ova. A series 
of ruptures, for the discharging of ova, take place in the median ventral 
line of mature segments. In some specimens the openings enlarge 
and become continuous with those of the adjacent segments thus 
forming a shallow groove on the ventral median line. This is the most 
remarkable external feature of my specimens. 
Genital pores lateral, situated in the middle of the segment. Cirrus 
and distal part of cirrus pouch are often protruded from the genital 
opening; this is readily seen by the naked eye. 
Genital organs. Testes oval or spherical in shape, scattered 
throughout the medullary field excepting the posterior portion where 
the female organs are situated. Cirrus pouch thin-walled, elongate 
pyriform in shape, proximally nearly attaining the middle of the segment; 
opens into the bottom of the distended genital cloaca which is lined 
with- the ciliated cuticular layer. Distal end of pouch sometimes 
evaginated. Cirrus unarmed, long and slender. 
Vas deferens coiled in the cirrus-pouch; its wall very thick, with 
inner circular and outer longitudinal muscle bundles, and lined with 
a ciliated cuticular layer, as in the genital cloaca. Vas deferens on 
leaving the cirrus pouch is thin-walled and strongly coiled. In sections 
of mature segments the loops of the vas deferens are often pushed 
out when the eggs are discharged through rupture of the segment. 
