ARRANGEMENT OF THE REPRODUCTIVE ORGANS. 527 



entirely absent in Tcenia saginata, and therefore furnish a very 

 welcome diagnostic characteristic for the young proglottides of T. 

 solium. The tubes are situated upon a somewhat long and slender 

 canal, which branches off, at the side of the uterus, from the common 

 transverse oviduct, and ascends in an anterior direction. According to 

 Sommer, these form a peculiar " intermediate " lobe of the ovary, but 

 I think that it is more natural, and also more in accordance with the 

 usual structure, to regard them as an isolated and separated portion of 

 the neighbouring lateral lobe. 



By its depressed form and much extended sides, the yolk-gland 

 repeats the proportions of the ovary, but in consequence of its more 

 simple contour its peculiarities are less striking. 



I need not dwell long upon the structure and connections of the 

 various reproductive organs. What has been said in this respect of 

 Tcenia saginata is also true of T. solium. At the most, there is only 

 a small difference between them, inasmuch as the canal connecting 

 the uterus with the shell-gland has in Tcenia solium a relatively 

 greater length ; hence the uterus appears of course still shorter. 



The smaller size of the reproductive apparatus makes it quite 

 possible that its development may take place over a shorter stretch 

 of joints. Although the first rudiments of the sexual organs appear 

 in both at pretty much the same distance behind the head, or 

 about the 200th joint, the period of sexual ripeness, in so far as it is 

 announced by copulation, and by the commencement of the transfer- 

 ence of eggs into the uterus, occurs at parts of the body which are at 

 least 150 to 180 joints distant from each other. Instead of being at 

 the middle of the seventh hundred, it is in Tcenia solium in the second 

 half of the fifth hundred that the first eggs are found in the uterus. At 

 the former of these places, that is, where the sexually ripe joints were 

 found in Tcenia saginata, the eggs of T. solium have already undergone 

 a great part of their development. The ramification of the uterus 

 begins very soon after the 600th joint, while in T. saginata it only 

 appears about the middle of the eighth hundred, that is to say, at a 

 place where Tcenia solium already exhibits ripe proglottides. 



The peculiarities of the processes which we have thus shortly 

 summarised are exactly the same as in T. saginata, so that it is not 

 necessary to enter into further particulars regarding them. To do 

 so would be only to repeat what has already been said (pp. 445, 446). 

 The specific peculiarities of Tcenia solium become conspicuous only 

 in the last phases, when the uterus begins to branch, and indeed find 

 expression only in the fact (Figs. 295 and 296) that the lateral 

 brandies are fewer in number. So long as the proglottides are broad 

 and short, the latter are of considerable length, and slender in form. 



