S. Yoshida 
577 
specimens agree well with those of C. verticillatuni (Rud.); the only 
differences lie in the dimensions of the various parts of body and the 
number of segments; my largest specimens consist of 580 segments. 
Such a number of segments has not so far been recorded. 
The anterior part of body is characteristically feeble and filiform, 
and so delicate that careless collectors usually leave the head attached 
to the host. The segments grow progressively in length posteriorly, 
the last segment being longest; the flaps on the posterior borders 
show slight individual differences; my specimens mostly differ from 
those previously described in respect to the flaps. 
The first segment bears four triangular flaps on each corner of the 
postero-lateral margin. In the 65th segment, the middle of the posterior 
margin begins to protrude and soon after it becomes the third flap. 
This condition (laciniated border) of the segment continues down about 
90 segments until about the 150th segment, in which the third flap 
begins to notch at its tip so as to form a bifid flap; the notch then 
becomes deeper and deeper, and ultimately the third flap divides into 
two; when this stage is reached, the posterior margin of each segment 
bears eight flaps, four on each, situated ventrally and dorsally. Of the 
four lateral flaps on each flat side, two are a httle larger and sharper 
than the median pair. This arrangement of the flaps prevails in most 
parts of the strobila. At about the 425th segment, the median flaps 
become indistinct and are represented only by a shght flexure of the 
posterior margin. The notch between the two primary flaps is shallow 
and wide, but it becomes gradually deeper posteriorly as the median 
flaps disappear. In the last segment, the primary flaps become rounded 
and convex on its inner side. The dimensions of various parts of a 
worm, which measures 150 mm. in length and is composed of about 
580 segments, are given (in mm.) in the following table: 
iBt 86th 120th 160th 226th 425th last 
Head Bothr. Hook segmt. segmt. segmt. segmt.segmt.segmt.segmt. 
Length 0-35—0-38 0-33 0 1 0 1 0-18 0-18—0-20 0-22 0-18 0-1 2-2 
Breadth 0-38 0-12 — 0-11—0-16 0-20 0-4 0-6 0-8 0-7 1-1 
The measurements taken from a smaller worm (45 mm. long) are 
as follows: 
Anterior Middle Last 
Head Hook Bothrid. segment segment segment 
Length 0-35 0-1 0-35 0-2 0-3 2-0 
Breadth 0-25 — 0-14 0-06 0-2 0-75 
