656 ME. F. E. BEDDARD ON 



pores are not situated. They are naturally in the medullary part 

 of the body, and in transverse sections are seen to occupy the 

 greater part of this, being neither dorsal nor ventral in position, 

 but simply central. They reach towards the margin of the 

 segment which is neai-est to them, far beyond the outermost of 

 the two excretory tubes of their side of the body — in fact, up to 

 the nerve-cord ; medianly they do not reach the median line of 

 the body, but extend beyond the innermost of the two excretory 

 tubes. They occupy perhaps, when seen in this view, one-fourth 

 of the entire breadth of a proglottid. They are not very close 

 together and are, at most, in two rows dorso-ventrally, there being 

 thirteen or fourteen to each row, and thus something like thirty 

 may be visible in a single section. In longitudinal sections seven 

 or eight of these double or partly single rows are seen, and they 

 may be observed to occupy the greater part of the segment. 

 There is also a second set of testes at the opposite margin of the 

 proglottid, very much fewer in number — perhaps four or five in a 

 transverse row, which lie on either side of the outer excretoiy 

 tube. 



The ovary may be regarded as a paired structure, and the two 



are partly separated by the yolk-gland, which lies between and 



behind them. In transverse sections through the ovaries, before 



the other parts of the female reproductive system have been 



reached, each ovary is seen to be distinct from its fellow and to 



lie on either side and below the larger of the two excretory tubes, 



which, in such a section, is seen to be not median in position. 



The excretory vessel is here only just below the cortical layer of 



the proglottid, though actually in the medullary layer. The two 



ovaries are not quite in contact below the vessel, or, at any rate, 



they can be recognised as two distinct bodies of a bushy form not 



unlike that which has been figured in other Tapeworms. "Within 



a few sections from that which has served as the basis of the 



above description the shell-gland is seen taking the place of part 



of that ovary which lies median of, i. e. not to the pore side of, 



the excretory vessel, and the oviduct leading from it to the ovary 



of that side is conspicuous. In a section or so further on in the 



series the yolk-gland appears ; although, as already said, this 



gland divides the two ovaries, it does not lie symmetrically with 



reference to the excretory tube. It lies almost entirely on the 



median side of this tube but also below it, though it does not 



extend at all on to the pore side of the excretory vessel. It 



occupies nearly the whole of the space on the inner median side 



of the excretory tube that, in previous sections, is occupied by the 



ovary of that side. In the next proglottid to that whose ovaries 



and associated glands have just been described, the ovary to the 



outside reached nearer to the outermost and smaller of the two 



latei-ally placed excretory tubes, but without arriving at it. In 



this case it is important to notice that there was no accessory 



group of testes lying between the ovary and the outermost of 



the two excretory vessels such as occur in the proglottid first 



