160 LEECHES 



— 6 equal annuli per segment; about 60 sucker papillae; 

 dorsal tubercles in 5 longitudinal rows. 



Actinohdella annectens Moore 1906 



— 6 unequal annuli per segment ; about 30 sucker papillae ; 

 tubercles confined to mid-dorsal row. 



Actinobdella inequiannulata Moore 1901 



Section 3. Key to the Family Piscicolidae 

 31. Pulsatile vesicles on margins of body (Fig. 11) . . 



32 



(a) (b) 



Fig. 11. Outlines of (a) Piscicola geometra and (b) Cysto- 

 branchus fasciatus showing lateral pulsatile vesicles. 



— Pulsatile vesicles absent 38 



32. Pulsatile vesicles small, difficult to see on preserved 

 leeches ; 14 annuli per segment; body not clearly divided 

 into anterior and posterior regions. 



Piscicola Blainville 1818 33 



— Pulsatile vesicles large, clearly seen after preservation ; 

 7 annuli per segment ; body clearly divided into anterior 

 and posterior regions. Cystobranchus Diesing 1859 35 



33. OcelU present on posterior sucker 34 



— OcelU absent from posterior sucker ; eyes, 2 (or 1) pairs ; 

 gonopores separated by 3 annuli. 



Piscicola punctata (Verrill 1871) 



