482 MICHAEL F. GUYER, 



increase, reuderiug the vagina more and raore prominent. It is plainly 

 visible in tlie very terminal proglottids. 



Receptaculum seminis. A short distance before the vagina 

 enters the shell gland, there is a noticeable increase in the diameter 

 and the walls are slightly modified in structure. This enlarged portion 

 is the seminal receptacle (Fig. 9 r.s) and is for storing the sperma- 

 tüzoa which pass up through the vagina from the genital pore. In 

 this species it is almost circular in frontal section (0.135 mm in dia- 

 meter) and of a lenticular shape in transverse section (0.078 mm in 

 diameter). 



Before leaving this point, there is a peculiar structure connected 

 witli the receptaculum which should be meutioned. Leuckart in his 

 description of T. saginata (1886, p. 444) pictures a slightly modified 

 structure just anterior to the receptaculum, but beyond meutioning 

 the fact that the latter is rather peculiarly connected with the vagina 

 anteriorly, gives no description or explanation of the same. In my 

 owu preparations of T. saginata, however, I find no such modification. 

 The structure referred to in T. confusa lies immediately in front of 

 the seminal receptacle (Fig. 9 x). Shortly before reaching the re- 

 ceptacle, the vagina becomes slightly enlarged and then abruptly 

 narrowed or rather, the narrow part seems to be of almost entirely 

 different structure, and projects forward into the slight swelling in the 

 vagina just mentioned. The walls of the new structure are thicker 

 and the lumen much narrower than those of the vagina proper. The 

 interior is apparently of the same structure as that of the latter. 

 The walls are surrounded by what appear to be great numbers of 

 small sphincter muscles (Fig. 9 sp.m), which are very distinctly Seen 

 in the longitudinal sections. The free nuclei mentioned several times 

 heretofore, are very numerous in this vicinity. This constricted part 

 of the vagina continues back a distance of about 0.11 mm to the 

 easily recognized receptaculum, which is always filled with spermato- 

 zoa in the sexually mature proglottids. 



The continuation of the vagina, if we regard the seminal recep- 

 tacle as an enlargement of it, is a wide thin walled canal, compar- 

 able in structure to the "Befruchtungs"-canal of Leuckart (1886, 

 p. 442) in T. saginata. This extends back to the shell gland (Fig. 10, 

 s.g), an oval body located about midway between the lobes of the 

 ovary. Before it reaches the shell gland, however, it receives a short 

 canal (0.1 mm long) from the cross band connectiug the two lobes of 

 the ovary (Fig. 10 s). 



