On tlie struc'ture of Tsicnia conl'usa Ward. 481 



'l'aeniae, has never bceu nieiitioiiod, to niy knowledge, I considered 

 this structure at first, as cliaiactcristic ouly of T. confusa, but upon 

 examiiiing my specimeus of T. saginata I found a prominent sphincter 

 uiuscle present in relatively the same position (Fig. 8 sp.m). It 

 ditfers from that of T. confusa in being broader and more band-like, 

 and like the other muscles of T. saginata is coarser and more power- 

 ful. As in T. confusa the vagina is narrower in its immediate 

 vicinity. 



Such a muscle as the above, has been found in two of the other 

 than human Taeniae but its presence in T. saginata^ I think, has 

 never before been recognized. In preparations from a very large 

 specimen of a peculiar luunan Taeiiia, which 1 have in my possession, 

 a vaginal sphincter muscle is very distinctly seen; but whether this 

 tapeworm is mcrcly a liighly modified form of T. saginata or a dif- 

 ferent species, I am as yet uuable to say. 



The greater part of the vagina, the canal connecting the modified 

 ends is, in appearance, much like that of T. saginata with the ex- 

 ception of the cilia, if, indeed, cilia are present in the new form. As 

 a matter of course, on general principles, one expects to find the 

 vagina of the Taeniae ciliated, but that such is the case in this form, 

 I am by uo means assured. Certaiu structures are present which at 

 first sight appear to be cilia, but upon very close examination their 

 Interpretation becomes decidedly doubtful. They do not have the cha- 

 racteristic fringe-like appearance that cilia usually possess, and in- 

 stead of pointiug toward the receptaculum as do cilia in the ordinary 

 forms these point outward toward to pore (Figs. 7 — 9 v). In fact, 

 they have more the aspect of numerous tiny folds in the wall of 

 the vagina than of cilia and I am rather iuclined to think that they 

 are such. Although I have carefully examined all my preparations, 

 I lind it impossible, without further evidence, to affirm positively either 

 that the structures are, or are not, cilia. 



Like the Vas deferens the vagina is lined by a continuation of 

 the cuticula, which, however, is considerably thicker than in the former 

 organ. The tube, as above indicated, measures about 24.5 fi in dia- 

 meter, the lumen about 19.5 a. More or less of a special case or 

 sheath-like structure (Fig. 7) surrounds it, inside of which is a sort 

 of c«tnnective tissue network or System of fibres very similar to those 

 surrounding the cirrus, and likewise having free niiclei ])lentifully 

 distributed throughout. As the proglottids grow older, the deposits 

 of pigment, which are not very plentiful in the younger proglottids, 



