110 



ANIMAL PARASITES AND MESSMATES. 



tube. The letters d d indicate the different cavities of 

 the stomach, which are filled in succession. We see in 



3 ^ 



Fig. 4. 



r 



2 



Fig. 5. 



Fig. 6. 



Fig. 4!— Different forms of the bite of a Leech. 

 Fig. 5.— 1. Sucker, open ; a. jaws. 2. One of the jaws magnified. 



Fig. 6.— Section of a Leech. a. anterior suclcer ; h. posterior sucker ; c. anu^ ; 

 d. stomach; (Z. aesophagus; i. intestine; s. glands of the skin. 



the fore part, the anterior sucker with the mouth, and 

 behind, the posterior sucker with the anus. At the 



