NEW ASEXUAL TAPE WORM. 825 



by 2*5-3 mm. wide. The proliferating end of the worm ceases 

 abruptly with the commencement of tlie bladder. This region, 

 which bears a great many lateral buds, shown in the text-figure 

 referred to, measures 17 mm. The region of the body which 

 bears these presumed buds (we shall consider their nature later) 

 does not differ much from the preceding section. It looks, 

 perhaps, a little more transparent, but it is divided up exactly in 

 the same way into proglottids, which are of about the same 

 dimensions as those elsewhere in the body. The buds form a row 

 on each side of the body and are quite lateral in position ; they 

 are not at all arranged in order of growth, though representing 

 very many stages. That is to say, the older buds alternate with 

 younger and older forms. Nor does every proglottid bear a bud 

 or pair of buds (one on each side). Between any two buds there 

 was often a variable number of proglottids without any trace of 

 budding at all. This, indeed, is necessary ; for the large size of 

 the buds would prevent their proper growth upon immediately 

 adjacent proglottids. I counted altogether 17 buds upon one 

 side and 18 upon the other. But I may have omitted one or two 

 in each case ; for it is a little difficult to fix the actual first 

 appearance of a bud. They begin, in fact, as an only just recog- 

 nisable rounded swelling of the edge of a proglottid. Sometimes 

 the swelling includes two proglottids. There is no question 

 whatever of the continuity of these buds (as I regard them) with 

 the parent stock ; they are most plainly outgrowths therefrom. 

 In later stages the minute round bosses at the edges of the 

 segments swell into spherical, largely transparent, vesicles, of 

 which, as the text-figiu-e (text-fig, 113) shows, the size varies — 

 possibly according to age. Later still, these bladders show a young 

 worm growing out from their distal extremity, which is usually 

 of considerably less diameter than the bladder which is attached 

 to the parent stock. It exhibits numerous wrinkles which I do 

 not definitely regai'd as the delimitations of proglottids. The 

 longest of these presumed young worms was about 4 mm. in 

 length ; the bladders reached a length of 2 mm. The exact 

 number of these more developed buds is faithfully reproduced in 

 text-fig. 113, 



§ Structure of the Parent Stock. 



I have investigated the anatomy of the worm by transverse, 



longitudinal, and sagittal sections. From an inspection of the 



former (see text-fig. 114, p. 826) the depressed form of the body 



. was obvious, the diameter of a section being about seven times 



its depth. 



At the thinner anterior end of the body, not far from the actual 

 extremity, transverse sections showed that the medullary region 

 of the proglottid was not more than two-thirds of the diameter of 

 the cortical region. The two were plainly marked off from each 

 other by delicate transverse fibres forming a very thin layer, and 



