LYMNvEID/E OF NORTH AMERICA. 123- 



In 1871, W. H. Dall published a revision of the Lymnaeids, and 

 under the subfamily Limnaeinae recognized the following genera and 

 subgenera : 



Genus Limncea Lam. 



Subgenus Radix Mont. 

 Subgenus Limnophysa Fitz. 

 Subgenus Bulimnea Hald. 

 Subgenus Acella Hald. 

 Subgenus Pleurolimncea Meek. 

 Subgenus Limncza Lam. 

 Genus Amphipeplea Nils. 

 Genus Erinna H. and A. Adams. 

 In 1872, G. W. Tryon continued Haldeman's monograph of Lym- 

 naea, recognizing the following groups : 



Genus Limncea Lam. 



Subgenus Auricula Klein. 

 Subgenus Bulimnea Hald. 

 Subgenus Limnophysa Fitz. 

 Subgenus Leptolimnea Swains. 

 Subgenus Acella Hald. 

 In 1884, the same author arranged the Lymnaeids as follows ini 

 his Structural and Systematic Conchology : 



Genus Limncea Lam. 



Subgenus Lymnus Montf. 

 Subgenus Radix Montf. 

 Subgenus Polyrhytis Meek. 

 Subgenus Bulimnea Hald. 

 Subgenus Limnophysa Fitz. 

 Subgenus Leptolimncea Swains. 

 Subgenus Acella Hald. 

 Subgenus Pleurolimncea Meek. 

 Genus Amphipeplea Nilsson. 

 Genus Erinna H. and A. Adams. 

 Genus Lantsia Jouss. 

 The treatment of the Lymnaeids in the works of H. and A. Adams,. 

 Fischer, Gray, Kuster, Clessin, Westerlund and other European writ- 

 ers does not differ materially from that cited above. 



In 1905, W. H. Dall revised the Lymnaeids of the northern part 

 of North America and presented the following synopsis which is,. 

 without doubt, the best treatment this group has received : 



Genus Lymncea Lamarck. 

 Subgenus Lymncea S. S. 

 Section Lymncea S. S. 

 Section Bulimnea Haldeman. 

 Section Radix Montfort. 

 Section Cyclolimucea Dall. 



