A NEW SPECIES OF TAPEWORM. 395 



anteriorly. The male organ pushing its way slightly upwards 

 causes the female organ to lie somewhat obliquely in the 

 segment. Nine millimetres from the scolex there occurs a break 

 in the genitalia caused by six barren segments. 



There are two semi-globose testes (Fig. 10, t.) situated in the 

 median transverse posterior portion of the segment, which, when 

 fully developed, have a diameter of 0*05 mm. Their efferent 

 ducts run vertically, coalescing and then curving distally to form 

 the vas deferens, which again curves proximally, and, dilating, 

 forms the vesicula seminalis, a long narrow sac 0*17 mm. long 

 and, when filled with sperm, 0*017 mm. in diameter. Then 

 follows a long tortuous seminal duct deeply embedded in the 

 tissue, and this, bifurcating, forms the membrane of the male 

 genital organ. The ductus efferentia becoming the infundibulum 

 or canal, and gradually widening, forms the inverted hollow cone 

 of the funicular male organ. Its length is 0*037 mm., with a 

 pore diameter of 0*007 mm. 



The female tract (Fig. 11) commences with a vestibule, which 

 is an inverted vertically-ribbed cone with a pore diameter of 

 0*007 — 0*008 mm. and a depth of 0*024 mm., the intercostals 

 being filled with a diaphanous tissue. At its apex is a narrow 

 canal, the vagina, which leads into an elongated semi-oval 

 vesicle or lumen, somewhat indented at its side, and composed 

 of the same diaphanous tissue as the intercostals. Thus it is 

 vase-shaped, and from an orifice at its distal end proceeds the 

 vaginal canal, which is a long narrow duct ending in a pyriform 

 receptaculum seminis. Midway down the canal is a bulbous 

 vesicle which undoubtedly acts as a contractile organ to accelerate 

 or retard the flow of the sperm. There are two pyriform ovaries 

 situated sub-median in the segment, with a length of 0*06 mm. 

 and a basal diameter of 0*024 mm. respectively. The basal end 

 of each ovary is at the extreme boundary, proximally and 

 distally of the prescribed limit occupied by the female genitalia 

 in the middle of the segment, about 0*278 mm. from each 

 lateral border. There is a wide space between each ovary which 



