S. Yoshida 
579 
last few segments. In some specimens the anteiior segments measure 
0-05—0-085 X 0-8—1-3 mm. (the proportion being as 1:15 or 1 : 16). 
The widest middle segments measure 0-4x3—4 mm. (1:75—1:10), 
and the posterior segments, which are narrow and elongate, measure 
0-85 X 1-7 mm. (1 : 2) or 1-1—1-5 x 2-0—2-2 mm. (1 : 15—1 : 2). 
The anterior and posterior parts of the strobila can readily be recog¬ 
nized at a glance. Anteriorly the segments are much broader than 
long, their surface is thin and smooth, and the posterior border 
Fig. 2. A. Anterior end. B. Anterior segments, x 10. 
of each segment more or less overlaps the following segment, giving 
a serrate appearance to the lateral margins. Posteriorly the segments 
become thickened by the accumulation of the ova in uterus, and 
narrowed at both the anterior and posterior borders, hence the serrated 
appearance is entirely lost. The most remarkable and peculiar 
feature of this species lies in the fact that some posterior segments 
fold ventrally upon themselves along the lateral margins. Posteriorly 
the folding becomes more and more pronounced and finally both 
margins meet each other along the ventro-median line making the 
Parasitology ix. 38 
