212 Mr Shipley, On a new species of Bothriocephalus. 
The testes are numerous, some 50 to 70, they lie in the inner 
core of parenchyma, and in every stage of development. The 
cirrus-bulb is very large and muscular. It extends from the 
opening of the penis right across the body to the ventral surface, 
lying in the median plane. The external opening of the penis 
lies slightly behind the level of the uterus-opening, near the 
posterior rim of the proglottis in the middle line. The cirrus- 
bulb stretches forward so that its inner end lies in a plane anterior 
to the outer. The inner end bends round for a short distance 
before fading away into the vas efferentia. 
A single excretory canal ran down each side of the body. The 
distinction between the inner and the outer parenchyma is more 
clearly marked at the anterior and posterior ends of each pro- 
glottis than in the middle where it tends to be obliterated by 
the uterus-sac and other organs. In longitudinal sections the 
muscles which pass from proglottis to proglottis are conspicuous. 
The contour of the sections taken from the anterior end of a 
proglottis is smooth but that of those taken through the salient 
posterior angles is markedly crumpled or crenated. 
Bothriocephalus histiophorus, n. sp. 
Scolex unarmed ; with dorsal and ventral longitudinal slit-like 
suckers, and a flat four lobed ‘cap’ ; length 1*5 ; constricted near 
posterior end. No neck. Proglottides funnel-shaped with markedly 
salient angles especially anteriorly ; ripe proglottis measures 
•5 mm. broad by 16 mm. in length. Cirrus-bulb large stretching 
from dorsal to ventral surface ; penis opens medianly and dorsally 
(Luhe) close behind it opens the vagina which is surrounded by a 
well-marked sphincter muscle ; uterus-sac pushed irregularly to 
the right or left and its pore is distinctly not median ; yolk- 
glands in outer parenchyma close to the surface; testes 50 to 75 
in inner parenchyma ; ovaries paired, lobed, uniting in a con- 
spicuous ootype ; no receptaculum seminis ; ova in uterus-sac 
*045 x 035 mm. 
Habitat. The alimentary canal of Histiophorus sp. captured 
in the Indian Ocean. 
