BRITISH FRESHWATER LEECHES 



1. Hiriido mediciualis. la, a few annuli in lateral view. 2. Ghssiphonia 

 heteroclito. 3. Piscicola geonietra. 4. Erpobdella octoculata. 4a and 4b, 

 a few annuli in dorsal view, enlarged to show variation in the amount ot black 

 pigment present. 5. Hemiclepsis mariyinato. 6. Helohdella stagnalis. 

 1. Haemopis sanguisuga. 7a, a few annuli in lateral view. 8. Glossiphonia 

 complanata. 9. Erpobdella testacea. 10. Therornyzon tessulatum. 

 The vertical line beside each leech represents its actual length. 



From a water-colour painting made by Dr. E. V. Watson. Reproduced from 

 Scientific Publication No. 14 of the Freshwater Biological Association, by kind 



permission of the Council. 



