THE ANIMAL PARASITES OF MAN 



exhibits two layers : an outer layer of small cells that are less sharply 

 defined, and an inner layer of larger cells. It contains, in addition, 

 calcareous corpuscles, muscular fibres and excretory vessels. It is 

 rich in glycogen. 



FIG. 252. 



FlGS. 252 and 252A. Diagrams of mode of formation of brood capsule and scolices. 

 (i) Wall of mother cyst, consisting of ectocyst and endocy^t ; (2) theoretical stage of invagination 

 of wall ; (3) a brood capsule with the layers of the wall in the reverse position to that in the 

 mother cyst ; (4) evagination of wall ; (5) invagination ; (6) fusion to form the solid scolex ; 

 (7) invagination of fore-part of scolex into hind-part. (Note. The size of the scolex is much 

 out of proportion to the brood capsule.) (Stephens.) 



