838 CESTODA. 



PLATE VIII. 



TAENIA SeRRATA. 



Fig I. — a. Six-hooked embryo, surrounded by egg-shell. 



b. Cysticorcus, with head evaginated, called pis'tformu 



from its pea -like form (nat. size). 



c. Part of the cysticercus magnitied head invaginated, 



provided with suckers and hooks, Numerous 

 calcareous particles are seen. 



d. Notice the saw-like margin of the segments, hence 



the name serrata. 



e. Shows how the old segments alter in form. 



f. Segment magnified to show the uterus. 



T^NiA Solium. 



Fig. 2. — a. Cysticercus with head protruding. 



h. Head magnified, showing the suckers and hookc. 

 c. Pipe segment, magnified 6 diameters 



TiENIA PeRFOLIATA. 



Fig. 3.— Observe the short but broad segments lying together, like 

 the leaves of a book ; hence the name perfoliata. Notice 

 the tapering posterior end, showing that it is a young 

 A\'orm. 



TiENIA EXPANSA. 



Fig. 4. — Observe that each segment is provided with two genital 

 pores like T. cucumcrina, but that the segments have 

 quite a diff'erent form. 



TjENIa Crassicollis. 



Fig. 5. — Segment magnified. 



Bothriocephalus Latds. 



Fig. 6. — Ovum highly magnified. Note the shape and observe the 

 shell provided with a lid for the escape of the ciliated 

 embryo. 



Fig. 7. — The ciliated embryo, with a six-hooked embryo formed in 

 its interior. 



Fig. 8. — The six-hooked embryo casting ofi' the ciliated coat. 



Fig. i). — The head. Observe {h.) one long groove or pit in the side 

 of the head ; the second groove not shown ; (c.) a section 

 of the head showing both grooves. 



Fig. 10. Segment magnified to show the rosette-like uterus. 



Fig. 11. — Shows the ventral genital pore. In a tape-worm the 

 genital pore is marginal. 



