On tlie structure of Taenia confusa Ward. 483 



Shell glaiul. The shell glaiid, as above mcntioncd, is an oval 

 body iiieasuriug about 0.25 nnii long by Ü.2 nnu wide, and is the 

 conmioii Center for all the canals of this region. The peculiar radiate 

 apljcaiance it has in section is due to the granulär cells which are 

 packed together, side by side, with their uarrovv euds or ducts point- 

 ing in toward the ceuter of the organ. Extending vertically through 

 its niiddle is a narrow duct which slightly enlarges near the center 

 (Fig. \0 s.y). This enlargcnient measures 0.02 mm wide by 0.068 mm 

 long. The duct is a direct continuation of the above mentioned wide 

 thin-walled moditication of the vagina connecting the receptaculum 

 aiid sliell gland. From Ü\c. anterior ventral side of the shell gland, 

 aftor being joined by the duct froni the vitellaria (Fig. 10 vi) which 

 conies in from the posterior side, it bends directly upward, passes 

 through the ceuter of the gland and after reaching the dorsal edge, 

 doubles back very slightly upon itself and extends forward as the canal 

 which bears the eggs to the uterus (Fig. 10 y). Unlike the case in 

 2\ saginatd or T. soJium, this canal does not enter the posterior 

 end of the uterus, but extends aloug above it for some distance, 

 gradually declining until it finally enters the dorsal side of the same. 



The ovary. This is a paired organ of about the same gen eral 

 structure as that of T. saginata or T. solium^ but differing very much 

 from either in form (Fig. 3 o). The wing-like expansions or lobes 

 are greatly elongated, kidney-shaped and larger than the correspond- 

 iug structures of the other Taeniae. They include between them the 

 area containing the receptaculum seminis, the shell gland and the 

 end of uterus. As stated, they are much longer than broad, the 

 larger one, which lies always on the opposite side from the vagina 

 measuring in general about 1.4 mm long by 0.56 mm broad. This 

 makes it about two and one half tiraes as long as broad. The one 

 lying on the same side as the pore is generally about 0.1 mm shorter 

 than its mate, measuring only about 1.3 mm in length. 



The lobes are connected by a broad (0.2 mm) transverse band 

 (Figs. 9 and 10 b) which Springs from about their median inner edges 

 and passes across the intermediate field just under the posterior edge 

 of the receptaculum. This arrangement of the cross canal is the 

 same as that of T. saginata or T. solium according to the Statements 

 of Sommer (1874, p. 26) for the latter forms, but dilferent from what 

 is given for T. saginata in the translation of Leuckart (1886, p. 444) 

 where is said that the cross canal passes over instead of under the 

 receptaculum, Tliis statement attributed to Leuckart is probably 



