376 ARTICULATA. ANNELIDA. 



usage. I am told by one of the carriers, that he can 

 pack them as closely as he pleases, in the moist sack 

 which he ties behind his saddle ; and sometimes he 

 stows his cloak and boots on the top of the sack. The 

 trader buys his leeches pell mell, big and little, green 

 and black, all the same : but he afterwards sorts 

 them for the market. Those are accounted the best 

 which are of a green ground, with yellow stripes 

 along the body." 



Unlike the Earth-wonn, the Leech is furnished 

 with eyes, exceedingly rudimentary, however, in 

 their structure, and so minute, as to be detected only 

 with the microscope. They are about eight or ten 

 in number, situated on the surface of the front 

 sucker, just before the mouth : a position which, 

 strange as it seems, undoubtedly renders them more 

 useful to the animal, particularly in seeking its 

 food. 



