NOTES ON PARASITES. 



79 



some of the cells of an epithelial layer ; and finally that 

 absorption, which presumably takes place all over the body 

 of Tape-worm, is usually in other animals effected by an 

 epithelium. All these statements make it probable that 

 such an epithelium exists, and Blochmann's preparations 

 demonstrate its existence in the parasites in question, 

 although in a somewhat modified form. 



Fig. I.— Transverse section through the outer part of the body wall of L/^M/a 

 monogramma x 800. After Blochmann. The muscles have been in all cases omitted. 



a. Cuticle. 



b. Basement-membrane composed of close network of fibrils. 



c. Epithelial cells. 



d. Branching cells of parenchyma. 



c. Cell of parenchyma containing a calcareous body. 



f. Parenchymatous network. 



g. Processes of epithelial cell terminative in swollen ends in the cuticle. 

 h. Flame cell of excretory system. 



The body of a Cestode such as Ligula consists of a 

 parenchyma or ground-substance (Fig. !._/) of the nature 

 of connective tissue in which lie embedded the various 

 organs, and which is traversed in various directions by 

 muscular and nervous strands. According to Blochmann 

 the external epithelium has to some extent sunk into this 



