BY T. HAUVEY JOHNSTON. 77 



end of the parasite to the other. They lie rather deeply iu 

 the parenchyma. Transverse fibres are well developed at 

 each end of the ripening segments, and probably are func- 

 tional in bringing about their separation. 



Genitalia. — Traces of the male genitalia are to be recog- 

 nised in the first segment, the rudiments becoming much 

 more distinct in the second, and fairly well developed in the 

 third. In the fifth, sixth, and seventh, both male and 

 female glands are present, the latter very rapidly increasing 

 in size, in passing back from the fifth to the seventh, where 

 they are fully mature. In the sixth and seventh the cirrus- 

 sac and vas deferens are at their maximum development, 

 though male sexual maturity may be reached in the fifth 

 segment. In the latter, the receptaculum seminis may be 

 somewhat distended by the contained spermatozoa. In the 

 succeeding two proglottids, this structure was greatly swollen. 

 In the next, the male and female organs, excepting the 

 cirrus-sac, the vas deferens, and part of the vagina, have 

 disappeared ; and, in segments containing ripe eggs, the 

 cirrus-sac is the only other structure recognisable. In some 

 instances there were indications that self-fertilisation takes 

 place, as the end of the cirrus appeared to be bent round to 

 enter the lateral part of the vagina. 



Male (jeiiitdHa. — There are four testes, of a rounded or 

 elliptical form, being from 0043 to 0060 mm. in diameter. 

 Three are situated behind the ovary, the other being lateral 

 to it on the side remote from the genital pore. The vas 

 deferens is a wide, coiled tube lying just behind and inter- 

 nally from the cirrus-sac. It ultimately enters the inner end 

 of the sac as a narrow tube, the greater part of it being thin- 

 walled, and thrown into a few long loops. It then passes 

 back again to enter the cirrus, which, in the state of rest, is 

 about Oil mm. long. 



The cirrus-sac is a large, elongate, fusiform organ situated 

 in the antero-latei'al corner of the segment. Its walls are 

 moderately muscular. From the inner end there pass off 



