On the stiUL'ture of THenia confusa Ward. 413 



uiider way, the geniUil \)on' bccomes (|iiit(j prominent so that the out- 

 line takes ou a soincwhat pentagona! lorni (Kig. l d). The proglottids 

 following these begin to lengthen rai)i(lly and broaden gradually until 

 the extreme brcadth is attained; in this State they are more or less 

 Quadrate in shape (Fig. 1 e). The terminal or ripe proglottids do not 

 show in any case the pumpkin-seed form so eharacteristic of T. safji- 

 nata, and are very slightly smaller at the anterior end, the tai)ering 

 being almost imperceptible. 



The extreme posterior end Hares out more or less and forms a 

 broad base for the attachment of the next succeeding segment (Fig. 1 f). 

 Owii striking thing in the ripe proglottid is the prominence of the 

 Vagina whicli persists froni its first formation throughout the entire 

 cliain, This, however, is not characteristic for this form only but oc- 

 curs also in T. sagiunta in a less marked degree. 



The cutieula. The cuticula is very delicate as compared with 

 of T. saginaia and can scarcely be detected under the low power of 

 the microscope. It splits or cracks rather easily and is generally 

 throwu into slight folds or wriukles. On cross section, the body shows 

 a much more irregulär or wavy outline than that of T. saginata, 

 due doubtless, to the thin cuticula. The cuticula varies slightly in 

 thickuess in diiierent proglottids and in various parts of the same 

 proglottid, being somewhat heavier in the posterior ones and very 

 slightly thicker in the neighborhood of the pore. On the dorsal side 

 of a sexually mature proglottid of T. saginata it measures 10.5 n 

 in thickness and correspondingly in T. confusa 4.5 ,/a, in the latter it 

 ai)pears to be homogeneous and in cross section no vertical striatious 

 are visible. Nothing reserabling cilia or processes of any kind are 

 fuund on the exterior. 



Just beneath the cuticula and seemingly almost a part of it, is 

 a double layer of very minute fibres lying at right augles to each 

 other. The layers are extremely thin and are best seen in frontal 

 section. The transverse fibres are outermost. In neither case is a 

 solid sheath formed, small interspaces remaining between the fibres. 



The s u b - c u t i c u 1 a r layer. Directly under the cuticula, or 

 l)erliaps more properly, the above mentioned Systems of fibres is seen 

 a border or fringe of more or less spindle-shaped cells, at right 

 angles for the most part to the surface. There is a greater or less 

 quantity of intercellular substance preseut which prevents one from 

 njaking a very definite study of the cells. They all have prominent 

 nuclei which seem to lie at about the center while one end of the 



