Explanation of Plate A 



Reproductions of fotografs of living leeches. 



Several of the upper group show the color patterns of some of 



the Glossiphonidae. The six figures to the right of the group 



show young leeches in different stages of development attacht 



to the ventral surface of the parents. 

 The lower group of figures shows the gastric and intestinal ceca 



more or less fild with blood. The delicate edge of the leech 



body is not evident in all cases. 

 The species represented are Placobdella parasitica and P. rugosa. 



