APPENDIX A 



THE SYSTEMATICS OF FRESHWATER 

 AND TERRESTRIAL LEECHES 



By K. H. Mann 



To give a full and accurate account of the leeches of the world as 

 far as they are known is beyond the scope of this book, even if it 

 were not an impossible task on account of the number of genera 

 and species that have been named without providing an adequate 

 description. To assess the validity of these names and the proper 

 relationships of the leeches which bear them would require many 

 years of work in many parts of the world. 



This appendix and the one following are attempts to present a 

 summary of the present position as far as it can be gleaned from 

 the literature without study of the original specimens. Nearly 

 three quarters of the world's genera are found in fresh water or 

 terrestrial habitats and these form the subject of Appendix A. The 

 genera are reviewed, with indications of their geographical distri- 

 bution, and a key is given for the identification to species of the 

 freshwater leeches of Central Europe, Britain and North America. 



The marine genera have been treated separately by Professor 

 E. W. Knight-Jones in Appendix B. He has given a key to the genera 

 of the world and followed this with an account of the main characters 

 of each genus and of the species occurring in the North Atlantic. 



Synopsis of the Hirudinea 



Order Hirudinea 



Suborder Acanthobdellae 

 Family Acanthobdellidae 



one Genus Acanthohdella Grube 1850 



A parasite of salmonid fishes of Lake Baikal and other parts of 

 Russia and Finland. 



147 



