588 
Cestodes from Selachians 
but the internal structures, especially the genital organs, differ from 
those of the genus and resemble more those of Onchobothrium. The 
laciniation of the posterior segmental border and the swelling of the 
posterior gravid segments are characters sufficient to distinguish the 
worm from any known species of Calliohothrium. 
Diagnosis. Length 100—160 mm. or a little more. Head sub¬ 
quadrate, with four bothridia situated diagonally. Bothridium large 
and elongate oval, measuring 1-1 x 0-6 mm.; its face divided into 
three loculi by two transverse costae, the anterior loculus is the largest, 
the other two are of subequal size. Hooks: two pairs of simple hooks 
at the anterior corner of anterior loculus; they are strongly developed 
and thorn-hke in shape. There are three accessory suckers. Neck 
variable in length and breadth. Strobila nearly uniform in thickness 
(1-0 mm. or more) throughout most of the body, but the posterior 
gravid segments are swollen so as to give a nodular appearance. Seg¬ 
ments : their length gradually increases caudally; maximum length 
in the last segment; maximum breadth near the posterior end; the 
breadth decreases posteriorly; posterior segmental border laciniated 
by four emarginations, two lying on the median line of the flat surface 
and two on the lateral margins. Cirrus openings, on lateral margin, 
irregularly alternate. Uterine pores situate along median line of flat 
surface. 
Cirrus pouch small, oval, measuring ca. 0-28 x 0-17 mm. Vas 
deferens nearly straight from cirrus pouch to median plane. Testes 
oval, 0-15 X 0-08 mm., scattered chiefly dorso-laterally to female 
organs, but a few posterior thereto. Vagina runs nearly parallel and 
dorsally to vas deferens, proximally it unites with the oviduct and runs 
to the shell gland. Ovary situate ventrally, occupying nearly all the 
median posterior half of segment. Yolk glands occur in numerous 
groups arranged longitudinally outside the lateral canals on both sides. 
Uterus in the median portion of segment; it swells considerably in 
the posterior or gravid segments. 
Host. Cynias manazo (Bleeker), spiral valve. 
10. Bhynchobothrium laciiiiatum n.sp. 
(Text-figure 4.) 
A few specimens of this species were obtained from the spiral valve 
of Cynias manazo (Bleeker) on May 1913, at Nakatsu. They were 
found associated with other species of cestodes. 
