THE LEECHES OF MINNESOTA 



13 



ai 



c 1 



J 



ill 



_<LfL 



c 2 



C2 



C 3 



C3 



C4 



d7 



C.5 



C 5 



CX2 



Q.2 



C 6 



ce 



C 7 



C 7 



C 8 



C9 



C9 



a.3 



Q3 



CIO 



CIO 



Cll. 



■*r 1 s c icoli 



C12 



iGlossipkonia / \ iWaxroLdella / \ ri s c i c o I 



/ ( C12 



~Fii.~4. 



If cs and cj in the above diagram had also been divided, ai would 

 be represented by eight annuli. The diagram represents the annula- 

 tion of typical somites of the genera selected excepting in the case of 

 Macrobdella. The typical somite of Macrobdella is quinquiannulate, 

 aj being divided into bj and b6. The diagram represents somite VIII 

 of Macrobdella decora. 



Figures four and five present 

 the system of notation adopted by 

 Professor Moore to indicate the re- 

 lationships of the annuli. 



The leeches vary considerably ai< 

 in size. The smallest is about an 

 eighth of an inch long and the 

 largest (Macrobdella valdiviana of 

 Chili) reaches a length of a foot 

 and a half or more and a width of 

 about one inch. The smallest Min- ct^ 

 nesota species is less than half an 

 inch long and the largest is from 

 seven to ten inches long and less 

 than an inch wide. 



The color markings are varied, 

 simple and irregular in some and 

 definit and regular in others. Some Fig. 5. 



Q3 



