A SURVEY OF THE GROUP 



31 



2 mm 



2mm 



Fig. 19. Various Piscicolidae. (a) Pontohdella miiricata in 

 characteristic resting position ; (b) P. muricata showing general 

 body form, with the posterior sucker much contracted; (c) 

 Pterobdella amara ; (d) Ozobranchiis hranchiatiis ; {e)Ozobranchiis 

 jantzeanus. ((a) after Harding, 1910; (c) after Kaburaki, 1921; 

 (d) after MacCallum and MacCallum,^1918; (e) after Oka, 1922). 



