Ol) the structure of Tuenia coufusa Ward. 487 



this period, as in all the later, the uterus exteiuls back cutiroly to the 

 sliell glaiul, and the dorsal and ventral sides of the progluttids cau 

 be readily distinguished. 



As for the sexually mature and ripe proglottids, since they have 

 been rather fully treated already, little moie need be said about thera 

 in this conuection. The branchings of the uterus begiu as bud like 

 projections from its sides and as these increase the sexual organs 

 gradually disappear; the testes first, followed by the ovary and the 

 vitellaria. As has been stated already, the vas deferens and the 

 Vagina, more especially the later, persist for a rauch longer time 

 (Fig. 2 v.d, v). The shell gland usually remains for a considerable 

 time, leaving here as in T. saginata, upon its disappearance a vacant 

 area free from branches. 



Eggs. The eggs in the ripe proglottids are oval in form and 

 are made up of several different parts (Fig. 11). First on the out- 

 side, is a thin transparent membrane, and next a layer of little rods 

 Standing side by side. Just inside the rods comes a thin layer or 

 Space, the exact nature of which was not determined. The elongated 

 inner portion is of about the same general outline as the outer cover- 

 ing of the egg, and is of diti'erent appearance in ditferent eggs. In 

 some there is a sort of dark cap-like structure at one end, in others 

 it is present at both ends, and in others yet, the dark area extends 

 along the side and one end, or often both ends. Usually the entire 

 Center is dark. In no case can the pyriform apparatus, or tail-like 

 pro'cesses spoken of by Leuckart (1886, p. 449) in connecting with 

 the eggs of T. saginata be found. It is not unreasonable to, suppose 

 however, that since they are very delicate, they may have been pre- 

 sent, but were destroyed through the poor preservation of the material. 

 The eggs raeasure in general about 39 in long by 30 fi wide. 



The developraent of the same has not as yet been worked out. 

 For comparison with eggs of T. solium and T. saginata see the 

 table below. 



It has been suggested that possibly this species is the same as 

 that, from a North American Indian, which Weinland described in 

 ls5S. If, however, the descriptions of the two forms are compared, 

 it will be found that they agree in scarcely any particular. The head, 

 neck and whole anterior half of his specimen were wanting. The 

 following suramary is taken directly from Weinland's description of 

 the form in his possession (1858, p. 44). 



33* 



