110 T. H. JOHNSTON. 



extending forwards below the vas deferens almost to the 

 anterior end of the segment. Its rudiments occur very 

 early, being present when the vaginahas become established. 

 In ripe segments no uterus could be distinguished, the eggs 

 lying in small groups in the parenchyma. This may be the 

 result of the formation of blind pouches which perhaps lose 

 their connection with the uterus. As mentioned before, 

 ripe segments were quite uncommon and consequently I 

 was unable to settle this point. Perhaps segments become 

 detached to undergo fuller development, since in the egg- 

 containing proglottids the whole of the male and female 

 glands and ducts were still fully developed, showing no 

 sign of atrophy, the eggs did not contain hexacanth embryos 

 and the constrictions between the segments were very well 

 marked. The brownish eggs are rounded or elliptical, 

 measuring about 32 by 19 micra. They are relatively few 

 in number. Two shells are present. 



The genital ducts pass between the two excretory canals 

 which here become widely separated, each approximating 

 its respective surface. There is no distinct genital papilla, 

 and a genital cloaca is practically absent, the male and 

 female ducts opening almost independently on the surface. 

 The genital apertures alternate fairly regularly in series, 

 three or four usually opening successively on the one side, 

 then about the same number opening on the other side. 

 The openings are usually situated near the junction of the 

 posterior fourth and the anterior three-fourths of the seg- 

 ment, though they may be placed only a little behind the 

 middle as shown in fig. 3. 



The presence of laterally placed vitellaria, the absence 

 of a uterine opening, the arrangement of the genitalia and 

 suckers, all indicate that the species belongs to the family 

 Ichthyotaeniidae, Ariola. If we accept the broad generic 

 characters assigned to the genus Ichthyobaenia, Lonnberg, 



