484 MICHAEL F. GIIYER, 



simply a mistake in translation, iuasmucli as in the German editious 

 he speaks of the canal in question as passing under (ventral to) the 

 vagina. At about the middle of the band, a sinall duct is giveu off 

 as already described, which runs only a short distauce tili it conuects 

 with the modified parts of the vagina extending from the seminal re- 

 ceptacle to the shell gland (Fig. 10 ^). It is very slightly coiled and 

 geuerally enters the vagina somewhat from the side. 



The vitellarium. The vitellarium or yolk gland (Figs. 3 —10 

 V t) is a triangulär, unpaired organ, extending out laterally about even 

 with the edge of the ovarian lobes, aud presenting no new or unusual 

 modificatious of structure. It shows a more or less scalloped edge 

 posteriorly, but anteriorly wedges in between the ovarian lobes and 

 tapers off toward the shcll gland. Its duct finally enters the gland 

 at the ventral posterior edge (Fig. 10) and iiumediately joins the 

 vertical canal through the same, As for the Contents of the vitellaria 

 they may be easily recognised from those of the ovary, because of 

 their much more finely granulär nature. 



The Uterus. The connection of the uterus with the shell gland 

 has been explained already, but as yet little has been said of the 

 structure of the uterus itself. It has, however, an exceptional struc- 

 ture, which defeats beyond all doubts any attempt to classify its pos- 

 sessor as one of the common forms of Taenia. 



In the proglottids ready for fertilization the uterus is a median 

 unbranched tube euding blindly near the anterior end, and extending 

 back posteriorly between the lobes of the ovary to the shell gland 

 (Fig. 3 u), The very great difference in structure in the ueighbor- 

 hood of the shell gland, between it and T. saginata or T. solium, has 

 already been pointed out. The latter have uteri which are very similar 

 in the unbranched State. They extend back and end near the anterior 

 edge of the lobes of the ovary, each connecting with the shell gland 

 b.y meaus of a slender canal which opens into its posterior end. In 

 the case of T. confusa, the canal (Fig. 10 y) opens into the dorsal side 

 of the Uterus, and the latter extends back until it lies directly against 

 the shell gland (Fig. 10 u). This arrangement may be seen in the 

 proglottids from the time that they become sexually mature until the 

 disappearance of the shell gland. In its primitive uumodified form 

 (Fig. 3 u) the uterus is about 0.15 mm in diameter. 



As the uterus fills with eggs it begins to bud out thickset and 

 stubby side-l)ranches which usually persist in the ripe Segments as 

 heavy, arborescent members (Fig. 2). In a few of the terminal pro- 



