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 

 (Liihe) 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. 



