PHYLUM PLATYHELMINTHES 



247 



echinococcus (Fig. 193) is exceptional in possessing only three or 

 four proglottides. In a few (Ligula and its allies Fig. 194), 



FiG.'104. Ligula. (After Leuckhai-t.) 



though the body has the normal elongated ribbon-like form, the 

 segments are not distinct, and in Caryophyllceus (Fig. 195), 



eo 



rso 

 me 



K 



vs 



FIG. 195. Caryophyllaeus. 

 (After Leuckhart.) 



FIG. 190. Amphiptyches. 



(After Spencer.) 



FIG. 197. 

 Archigetes. 



(After Leuckhart.) 



Amphilina, Amphiptyches (Fig. 196), and Archigetes (Fig. 197), 

 (Monozoa), segmentation is entirely absent, the whole body in 



