526 



ORGANIZATION OF T^XIA SOLIUM. 



an influence compared with which that of the calcareous corpuscles, 

 vessels, and muscles is quite insignificant. What we have already said 

 in this respect of Tcenia saginata is true, even down to details, of T. 

 solium, which so closely agrees with it both in structure and develop- 

 ment that, with some slight alterations, the former description might 

 be adopted almost word for word. 1 Accordingly, it is unnecessary to 

 describe minutely the reproductive apparatus of this species. It will 

 be sufficient for our purpose to emphasise the differences which exist 

 between the two forms ; and in regard to any other points, to refer to 

 what was said of these organs whilst treating of T. saginata. 



These differences arise in great measure from the fact, already 

 often mentioned, that in its vegetative powers Tcenia solium falls far 

 short of T. saginata. Thus, not only is the form of the uterus 

 influenced by this fact, but the whole of the reproductive apparatus. 



This is especially evident from the fact that the sexually mature 

 joints of Tcenia solium are considerably smaller than those of 

 T. saginata. They exhibit hardly more than half the diameter of 

 those of the latter, being not more than 4'5 to 5 mm. in breadth, and 

 2'5 to 3 mm. in length. These differences in size of course find 

 expression also in the individual parts of the reproductive apparatus. 

 All the dimensions are smaller, the sexual pores less prominent, the 

 testes considerably fewer in number, and the csecal tubes of the yolk- 

 gland, as well as of the germ-glands, are less branched and less 



compactly aggregated. Even the form 

 of the germ-glands corresponds to the 

 generally smaller space. Their longi- 

 tudinal diameter is less than in T. sagi- 

 nata, and the round discoid form of the 

 latter is exchanged for a transversely 

 oval one. This is true especially of the 

 smaller lateral lobe which lies under 

 the vagina, on the right or on the left 

 of the middle line, according to the 

 position of the genital pore. But on 

 the same side above the vagina, and 

 in the angle open in front, which the 

 descending limb forms with the 

 uterus, there is always (and not 

 merely occasionally, as I stated in 

 the first edition of this work) a group of ovarian tubules. These are 



FIG. 294. Reproductive organs of 

 Tcenia solium (x 10). g.p,, genital 

 papilla; cL, cloaca. Male organs. 

 <., testes; v.d., vas deferens ; c.p. t 

 cirrhus-pouch. Female organs. ov. t 

 ovary; y.g. t yolk-gland; sh.g., shell- 

 gland; r.s., receptaculum seminis; M., 

 uterus ; d.o. , detached portions of ovary. 



1 Indeed, the account given in that place of the reproductive organs of Tcenia saginata 

 was largely borrowed from the description which I gave in the first edition of this work of 

 the characters of T. solium (p. 261 et seq.). 



