LEECHES 



in the gut ; the specimen illustrated in Fig. 1 was preserved shortly 

 after gorging itself on the author! The colour pattern is very 



-Anterior sucker 





XXEZ: 



Clitellum 



-30 



Male pore 



-Female pore 

 • 40 



■50 

 9th nephridiopore 



-60 



Segmentaf receptor 



■90 



I cm 



-Posterior sucker 



Fig. 1 . (a) dorsal view of Hirudo medicinalis ; 



(b) diagrammatic ventral view of Hirudo medicinalis. 

 The segments are numbered in roman numerals and the annuli 



in arabic. 



