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On sagittal sections, it sometimes appears to be both anterior and 

 posterior, but in such cases I believe that this is only apparently the case 

 and in reality the pads of fibrous tissue belong to separate segments. In 

 sagittal sections one often finds two pads between two adjacent .uteri ; 

 on a horizontal section it would be seen that the uterus of a third segment 

 has been crowded out to the side between the two uteri visible on the 

 section. Owing to bad preservation of my material just at this part of 

 the worm I cannot venture any statement as to the origin of the pads of 

 fibrous tissue. 



The uterus after having received the fertilised ova undergoes several 

 changes ; at the time when first filling with ova, it is simply a wide trans- 

 verse tube. The ova at a slightly later stage appear to be surrounded by 

 septa formed by cells originating from the uterine walls. (Rather 

 macerated material.) With the disappearance of testicles and ovary 

 the segments lose breadth and contract latero-laterally, forcing the uterus 

 to become more and more globular. 



At this stage an organ resembling " Wolffhiigel's Faserknaiier' becomes 

 apparent ; its early stages are unfortunately lost to me on account of the 

 maceration the material has undergone just at this part. In 

 ^S. centrifunctata it has much the same appearance in certain stages as 

 in S. hefatica ; in both species it is an outgrowth of the uterus, not of the 

 ovarum. On transverse sections (about 120 cm. from scolex) one notices 

 the following changes : — The ova all lie on that side of the uterus nearest 

 to the surface of the worm, in one segment perhaps dorsally, on the next 

 it may be ventrally, according to the position of the uterus, which again 

 depends on the pressure from the uteri proceeding and following it in the 

 strobila. 



On the other side of the uterus is a mass of fibrous tissue with radial 

 or parallel fibres, which in its further development gives rise to the 

 Faserknaiiel, which in turn develops into egg-pouches. (Fig. 8.) This 

 mass of fibrous tissue is in early stages arranged within the uterus con- 

 verging towards the side opposite to the ova; it passes beyond the uterus 

 into the parenchym of the body, still converging ; the opening it passes 

 through is at first large, later thig contracts, thus forcing the fibres to 

 form a double radiation, one in the uterus, the other outside it. At first 

 nuclei are very numerous, later on they become rarer. (Fig. 9.) The 

 portion outside the uterus grows larger and more globular, the fibres arrange 

 themselves so as to form a number of pockets, the uterus itself during 

 this process diminishes in width. (Fig. 10.) Then we see ova appearing 

 in the pockets of the fibrous organ. (Fig. 11.) As they disappear at the 

 same time from the uterus, there is no doubt from where they came. 

 Finally all the ova are in the pockets of the organ and the original uterus 

 atrophies. (Fig. 12.) The fibres of the egg-pouch form an outer cir- 

 cular layer around the inner pouches, which themselves consist of fibres. 

 In each case the fibres seem to be arranged so as to form lamellae. 



