164 



COLLEGE ZOOLOGY 



vcts.def-. 



fi 



•or qen. 



-nervl- 



ov 



ov 



its parasitic 

 habits. There 

 is no alimentary 

 canal, the di- 

 gested food of 

 the host be- 

 ing absorbed 

 through the 

 body- wall. The 

 nervous system is 

 similar to that 

 of Planaria and 

 the liver-fluke, 

 but not so well 



cjlvlt slhid 



Fig. 10S. — A proglottis of the tapeworm, Tania solium, 

 with mature reproductive apparatus, can.excret, longi- 

 tudinal excretory canals with transverse connecting 

 vessels ; gl.vit, vitelline or yolk-glands ; nerv.l, longi- 

 tudinal nerves; ov, ov, ovaries; por.gen, genital pore; 

 schld, shell-glands; titer, uterus; vag, vagina; vas.dcf, vas 

 deferens. The numerous, small, round bodies are the developed (Fig. 

 lobes of the testes. (From Parker and Haswell, after io o nerv T) 

 Leuckart.) ' m ' '' 



Longitudinal ex- 

 cretory tubes, with branches ending in flame-cells, open at the 

 posterior end and carry waste matter out of the body (Fig. 10S, 

 can. excret.). 



A mature proglottid is almost completely filled with reproduc- 

 tive organs ; these 

 are shown in 

 Figure 108. Sper- 

 matozoa originate 

 in the spherical 

 testes, which are 

 scattered about 

 through the pro- 

 glottis; they are 

 collected by fine 

 tubes and carried 

 to the genital pore 

 (por.gen.) by way 



of the vas deferens Leuckart.) 



Fig. iog. — Stages in the development of the tape- 

 worm, Tcbnia solium, to the cysticercus stage, a, egg 

 with embryo, b, free embryo, c, rudiment of the 

 head as a hcllow papilla on wall of vesicle, d, bladder- 

 worm (cysticercus) with retracted head, e, the same 

 with protruded head. (From Sedgwick, partly after 



